GREAT FUNCTION.

So good that in a very short time I have a LARGE amount of crap in my airbox and there's a lot of little things wedged in my Filter.

This is not a bad thing, it's just sucking in loads more air.

Not just laying in the airbox, but suck on the surface of the filter and wedged in the cracks... litte pieces of paper and debris, leaves, bugs are in there and especially a piece of plastic wrapper definitly block flow... The filter is also a lot dirtier in general than the last time I cleaned it (in half the time between cleanings).


Just an FYI for those with the part and that haven't check yet... A little more frequent blow outs should be the rule...

Don't worry. Be happy. The RPI scoop is WONDERFUL!







PS. My apologies for this post, but my previous attempts at deadpan rebuttals to the RPI zealotry apparently fell on deaf ears.

Perhaps BMW had some method in their madness regarding the stock intake design after all. Time for a sock or something to account for debris intake in scooped cars.

This may have been covered before, but where is the best place to get the RPI intake from? Is it from RPI directly? Or is there a dealer that can "hook it up" a bit? :)

This may have been covered before, but where is the best place to get the RPI intake from? Is it from RPI directly? Or is there a dealer that can "hook it up" a bit? :)

You have to get it from them direct, not sure what you meen by hook it up. It's only $100 to begin with, pretty good deal if you ask me.

I ordered the kit for the ///M. It is $219 + CA tax. The scoop alone is $129, but Dinan will cost 3X that amount. RPI will ship it on Friday and I should get it next week. Can't wait to see the improvement.

Thanks Rob!

I was asking about a hook-up cause I guess I have this compulsive disorder about not buying anything at list price. ;)

Hey it's a good mod and the extra junk in the airbox is exactly what I wanted to see honestly...

I just wanted to be sure you all knew. I would have a monthly blow out is all.


I would think about possibly using epoxy or tack welding a wide / thin wire mesh across it after install (that could be clipped off if needed) , but that's abot it. nothing that would damage the ram effect...

help me understand this whole "scoop" thing. Is it just literally a scoop that forces more air TO the filter, but doesn't allow for any higher flow of air within the air box or through to the engine? I don't see the benefit. Please, educate me.

Yeah, it's just a scoop. But even so it should increase the airflow through the engine to a slight but measurable degree. Unless you're running up against the flow limits of the engine increasing the pressure in the fashion should increase the flow rate and max power roughly in proportion. Of course the maximum dynamic pressure you could create using such a scoop might be 2-3% of the static atmospheric pressure so the gains would be small, but they should be there - and have apparently been verified by dyno testing.

I am skeptical, at best. If the Dinan Ram air scoop, WITH matching software, only claims 5 HP, how does a scoop with no software make more? Also, in testing, they mentioned that the engine "learned" to adjust for the larger air coming in. I thought the engine only "learned" driving styles, adjusting the drive-by-wire to match driving styles. I believe the air flow sensors reset every time the car is shut off. If I'm right about this, it means the LOWER HP numbers that the Dyno's started with would reappear every time you drive the car, with the ECU adjusting for it as you drive. I'm fairly sure those particular settings are NOT stored in a memory...but I'll check, as I'll be at the dealer today.

The number difference because Dinan's ram air is for regular Z4. Dinan do not make one for the M. RPI is specific for Z4M Coupe.

It's amazing..anybody can make a piece of c#%p and it will sell...I don't get it...are most people on here so gullible to buy into this?? All it is, is some sheet metal bent to resemble a scoop and to be honest it is done badly at best...looks like a 13 year old is making these things...

And the supposed dyno results...oh where do you even begin on that...lets look at it then...a scoop for this purpose is to catch the air coming into it...right...so if the scoop(aka car) is stagnant on a dyno where is the airflow coming from??? I know your gonna say they probably had fans sitting in front of the car during testing... but the power gains they are claiming are left to the imagination as to where they got the numbers...dyno results BY themselves need to be taken with a grain of salt...you have to assume that test conditions (ambient as well as car) are the same...yes by basic thermo you can account to temp/press differences but these are only at best assuming nothing else has changed...there are way too many variable that go on within the engine itself that can't be accounted for...

So sounds to me a whole lot of trickery is going on with the dyno results to pull those numbers out of thin air...or should I say "scooped air"

What they should be showing is some real evidence that these scoops do provide a measurable increase in airflow and pressure to the intake system.. This would take some basic equipment that is readily available to show the increase in airflow either by actually measuring the velocity of the air coming in or pulling the voltage off the MAF to get Mass Flow Rate and then calculating the velocity...also the intake pressure would be shown as well...these would both be showing the before and after results of the "tin scoop"......that would be more credible than a dyno test that is sitting stagnant...I mean come on..seriously...thing about it...

I'm not at all trying to be hard on the guy...it's really being hard on all the gullible folks out there that read something once or see a dyno result and immediately assume this is the next "shiznit" .... DO YOUR OWN RESEARCH...AND THINK WITH SOME LOGIC...

I am skeptical, at best. If the Dinan Ram air scoop, WITH matching software, only claims 5 HP, how does a scoop with no software make more? Also, in testing, they mentioned that the engine "learned" to adjust for the larger air coming in. I thought the engine only "learned" driving styles, adjusting the drive-by-wire to match driving styles. I believe the air flow sensors reset every time the car is shut off. If I'm right about this, it means the LOWER HP numbers that the Dyno's started with would reappear every time you drive the car, with the ECU adjusting for it as you drive. I'm fairly sure those particular settings are NOT stored in a memory...but I'll check, as I'll be at the dealer today.

+1

But the "learned" should really be "compensate".. What happens is the ECU is calculating the correct amount of fuel to inject based on the the sensor readings...in a nutshell without going too deep, the ECU is looking at the MAS(mass air sensor) this tells the computer the mass of air that is coming in..it also looks at the TPS...this tells the ECU the load on the engine...so it gather this info plus a few more to determine the mass of fuel required to to have complete combustion...it also takes O2 sensor readings to fine tune it..kinda a check and balance...this is what they are talking about...but the computer is only programed for air pressure at sea level and higher altitude where the density is less..but for extreme cases where forced induction is added that is why recalibration is needed..because the factory file doesn't know what to do... For basic bolt on...it can compensate to a certain degree...but will respond better with recalibration...but for most this may be more than what they want...

It's amazing..anybody can make a piece of c#%p and it will sell...I don't get it...are most people on here so gullible to buy into this?? All it is, is some sheet metal bent to resemble a scoop and to be honest it is done badly at best...looks like a 13 year old is making these things...

And the supposed dyno results...oh where do you even begin on that...lets look at it then...a scoop for this purpose is to catch the air coming into it...right...so if the scoop(aka car) is stagnant on a dyno where is the airflow coming from??? I know your gonna say they probably had fans sitting in front of the car during testing... but the power gains they are claiming are left to the imagination as to where they got the numbers...dyno results BY themselves need to be taken with a grain of salt...you have to assume that test conditions (ambient as well as car) are the same...yes by basic thermo you can account to temp/press differences but these are only at best assuming nothing else has changed...there are way too many variable that go on within the engine itself that can't be accounted for...

So sounds to me a whole lot of trickery is going on with the dyno results to pull those numbers out of thin air...or should I say "scooped air"

What they should be showing is some real evidence that these scoops do provide a measurable increase in airflow and pressure to the intake system.. This would take some basic equipment that is readily available to show the increase in airflow either by actually measuring the velocity of the air coming in or pulling the voltage off the MAF to get Mass Flow Rate and then calculating the velocity...also the intake pressure would be shown as well...these would both be showing the before and after results of the "tin scoop"......that would be more credible than a dyno test that is sitting stagnant...I mean come on..seriously...thing about it...

I'm not at all trying to be hard on the guy...it's really being hard on all the gullible folks out there that read something once or see a dyno result and immediately assume this is the next "shiznit" .... DO YOUR OWN RESEARCH...AND THINK WITH SOME LOGIC...


Rather than just bullshit speculating / pontificating....

I simply went to a dyno shop. Not huge gains, nothing spectacular, but then neither was the exhaust. I got 4 with the RPI alone. standard filter w carbon escape gas filter removed.


here's the part where you might want to speculate even more and ask deep probing questions about the tuning shop but the friends I have their basically hate that my car is not Japanese and give me absolutely no love:D But as we share two track bikes they also give me absolutely no charge... same dyno, same temp at test and within a point of pressure, same blower at the front of the car set at same speed. Only 50 mph, as done last time for cooling... So results could well have been better if we upped it to simple highway speed.

Unlike Bimmerzealot, I didn't keep the file as I was just happy there was a reasonable gain... (and wasn't expecting a troll to pop in and miz an ounce of truth about the cars ECU adjusting with 3 pounds of speculation about how it applies to the RPI intake.


I also just got the K&N drop in (same as dinan) and that plus the removal of the carbon gas escape filter removal shouldn't hurt. The carbon filter removal is worth a pony... maybe the K&N is too. Not worth a dyno for me though unless I'm parked up for a track day on the bikes.

As for the car compensating that's true. It does respond to more or less and adjusts, what you wrote is more a case for it adjusting than against...




Not saying any of this is earth shattering, it's not. but when the folks with the 06+ si have so little to choose from, little things is all we have...


So there it is...

I'm happy with it and sure as hell not selling anything.

Nothing to scream about...

But then nothing to be an a$$hole about either.

It's amazing..anybody can make a piece of c#%p and it will sell...I don't get it...are most people on here so gullible to buy into this?? All it is, is some sheet metal bent to resemble a scoop and to be honest it is done badly at best...looks like a 13 year old is making these things...

And the supposed dyno results...oh where do you even begin on that...lets look at it then...a scoop for this purpose is to catch the air coming into it...right...so if the scoop(aka car) is stagnant on a dyno where is the airflow coming from??? I know your gonna say they probably had fans sitting in front of the car during testing... but the power gains they are claiming are left to the imagination as to where they got the numbers...dyno results BY themselves need to be taken with a grain of salt...you have to assume that test conditions (ambient as well as car) are the same...yes by basic thermo you can account to temp/press differences but these are only at best assuming nothing else has changed...there are way too many variable that go on within the engine itself that can't be accounted for...

So sounds to me a whole lot of trickery is going on with the dyno results to pull those numbers out of thin air...or should I say "scooped air"

What they should be showing is some real evidence that these scoops do provide a measurable increase in airflow and pressure to the intake system.. This would take some basic equipment that is readily available to show the increase in airflow either by actually measuring the velocity of the air coming in or pulling the voltage off the MAF to get Mass Flow Rate and then calculating the velocity...also the intake pressure would be shown as well...these would both be showing the before and after results of the "tin scoop"......that would be more credible than a dyno test that is sitting stagnant...I mean come on..seriously...thing about it...

I'm not at all trying to be hard on the guy...it's really being hard on all the gullible folks out there that read something once or see a dyno result and immediately assume this is the next "shiznit" .... DO YOUR OWN RESEARCH...AND THINK WITH SOME LOGIC...

Firstly; you dont even drive a Z4 so I dont know where you get off arguing with Z4 drivers about OUR products. But if you're gonna do that you should go over to the 335i drivers, the M5 drivers, and the M6 drivers and tell them their all saps, what kind of response do you think you'd get from them? :nono

Secondly; I dont think you spent 6-hours with RPI dyno testing the scoop to see first hand the results, I did. Sounds to me like you're sitting on your ass on the other side of the country trying to start an argument you clearly know nothing about.

Lastly; to answer your question, yes the car was stagnant on the dyno and yes there was a 70 mph fan @ 8 ft blowing at the front of the car. So by your "theory" AFE, AEM, Injen, Dinan, GruppeM, Helena all of those companies can just all close up since according to you their numbers all come out of "thin air" right? Since all dyno runs are conducted in the same way. The reason the results are there is because the car was dynoed originally WITH the factory scoop in place, once again stagnant with the same fan at the same distance, then the scoop was added and the same run under the same conditions was done agian; higher HP and torque values were found. So therefore we can conclude that performance was gained from the ONE variable that was changed the RPI scoop. The same would go for any other type of intake based tuning. You clearly dont understand the purpose of dyno runs or how their numbers are used so I wont bother educating you.

In conclusion, you're stupid, please dont come on our forum anymore and try to pull an Einstein, back to kindergarten for you. :shifty

I just got my RPI instake and skid plate today. The install wasn't too bad. I thought the last screw was PITA. Didn't have a chance to take it out for an extend ride to see how it feels. I have to said, the stock cup is a joke. How can they restrict the air flow wiht that little cup.

Going for a suspension upgrade next week.