http://photos.e46fanatics.com/data/500/44772M3_part_deux012.jpg

http://photos.e46fanatics.com/data/500/44772M3_part_deux008.jpg

http://photos.e46fanatics.com/data/500/44772M3_part_deux010.jpg

http://photos.e46fanatics.com/data/500/44772M3_part_deux007.jpg

http://photos.e46fanatics.com/data/500/44772M3_part_deux011.jpg

looking good

Beyond good. Very nice. I love the exhaust tips.

Very nice, but are the exhaust tips supposed to be blacked out like that? Personally I prefer polished tips.

Thats hot. How do you like the Dinan exhaust. Impressions compared to stock?

I believe the reason Dinan made the tips non-polished is because it exits on the left side only, the right side is purely for looks. Therefore, there would be carbon/sut buildup on the left, and not the right. It was there way of keeping them the same throughout the years.

Thats hot. How do you like the Dinan exhaust. Impressions compared to stock?

I believe the reason Dinan made the tips non-polished is because it exits on the left side only, the right side is purely for looks. Therefore, there would be carbon/sut buildup on the left, and not the right. It was there way of keeping them the same throughout the years.


Exactly. There's a ton of info on the E46 M3 exhaust on the Dinan site. the sound is exactly what I wanted. You can't compare it to stock in any way. The only way to judge an exhaust is in person. You either like it or ya don't. Once ya know ya like an exhaust, then you ahve to decide if you can live with it. The Dinan works for me on both counts.

Dinan e46 M3 white paper (http://dinancars.com/whitepapersFile.asp?ID=3)

I have seen a silver dinan exhaust here in DC, the one and only I have ever seen.

Hmmm, interesting design
(image cribbed from Dinan White paper)
http://dinancars.com/Admin/images/whitepapers/four.jpg

however, I'm curious as to how much benefit there is from using only the two exhaust outlets vs. using the muffler as a chamber with 4 outlets.
I believe this decision probably comes down to sound production rather than any hydraulic gains. :dunno

Hmmm, interesting design
(image cribbed from Dinan White paper)
http://dinancars.com/Admin/images/whitepapers/four.jpg
hydraulic gains. :dunno


It reduces backpressure by eliminating the myriad turns required to keep the lengths of the exhaust equal across 4 outlets, there are no hydraulic anything in an exhaust. It's all in that whitepaper from which you cribbed the pic. :stickoutt

It reduces backpressure by eliminating the myriad turns required to keep the lengths of the exhaust equal across 4 outlets, there are no hydraulic anything in an exhaust. It's all in that whitepaper from which you cribbed the pic. :stickoutt

Why wouldn't it come out of the first set of pipes (left) since there would be less distance?

It reduces backpressure by eliminating the myriad turns required to keep the lengths of the exhaust equal across 4 outlets, there are no hydraulic anything in an exhaust. It's all in that whitepaper from which you cribbed the pic. :stickoutt
That's why I suggested they use the entire muffler as a dishcarge chamber with 4 outlets. That would provide greater decrease in backpressure than an additional 90 deg bend, which is what they've got. Again, I think that this detail has to do with the kind of sound they wanted to create rather than any efficiency gains.

BTW, hydraulics refers to flow through a pipe, not shock absorbers. :stickoutt

That's why I suggested they use the entire muffler as a dishcarge chamber with 4 outlets. That would provide greater decrease in backpressure than an additional 90 deg bend, which is what they've got. Again, I think that this detail has to do with the kind of sound they wanted to create rather than any efficiency gains.




You can't just dump the gas into the a large chamber and expect it to find it's way out the four outlet holes. If you look inside an exhaust ut's a series of baffles that guide the gas to the outlets.

http://dinancars.com/Admin/images/whitepapers/three.jpg

It takes far more turns to utilize all 4 outlets with equal exhaust path lengths than to use just two.

It takes far more turns to utilize all 4 outlets with equal exhaust path lengths than to use just two.

Once again, why not have the exhaust come out the first set (left side) than the second, there would be less distance for the exhaust to travel.

Once again, why not have the exhaust come out the first set (left side) than the second, there would be less distance for the exhaust to travel.

Because there would be no place to put a muffler, and it would be loud as hell.

Once again, why not have the exhaust come out the first set (left side) than the second, there would be less distance for the exhaust to travel.


The total distance is not an issue, it's the complexity of traveling the distance that matters. Turning the gas derceases the velocity at which it exits the outlet thus increasing backpressure.

To switch gears, how are the coilovers working? Was it a switch from stock to the TCK, or did you have something in between?

Truth- Those wheels look great on your car.
I really like those forged CSL reproductions. IMO, they look better than the real thing.

My CSL replicas, sadly cast and not forged :( :
http://forums.bimmerforums.com/forum/showpost.php?p=4388021&postcount=47

To switch gears, how are the coilovers working? Was it a switch from stock to the TCK, or did you have something in between?


OEM to TCK. They are sublime. Truly an amazing transformation. I could not be happier. I can't wait to get them on a track.


Truth- Those wheels look great on your car.
I really like those forged CSL reproductions. IMO, they look better than the real thing.

My CSL replicas, sadly cast and not forged :(


Thanks, the RAC's are also wider which is how I can run 275/30 all the way around. The price is also quite a bit more than the ZCP's or the replicas.

are those RG4's? everything looks awesome... gotta love carbon black also :-P

Did you go through that "four-corner balancing" thing, or just set them to the same height?

Did you go through that "four-corner balancing" thing, or just set them to the same height?


To install coilovers without corner balancing the car is pretty pointless. Just as bad as installing only springs to lower the ride height. So yeah, it was corner balanced.


are those RG4's? everything looks awesome... gotta love carbon black also :-P

Yes, they are, thanks.

Does the Dinan exhaust require Dinan software?

Does the Dinan exhaust require Dinan software?

No. But I'm running Dinan Stage 2 software. Car seems to be running a little rich but mid range torque is improved.

Dinan states that you need the stage 2 software for the Exhaust...
I know I had to get it with mine...

I'm curious why you would say that the car seems to be running rich?
Why do you say that?

Dinan states that you need the stage 2 software for the Exhaust...
I know I had to get it with mine...

I'm curious why you would say that the car seems to be running rich?
Why do you say that?


I can smell it.