I was thinking of buying a new 335i or a 135i but i'm coming a 1999 M3 that is supercharged and I need alot of HP to be happy. What I'm looking to find out is how much HP I can make from the 3.5 motor and a idea how much money it's going to cost?

Do some searches on the forum, you'll find many answers. Piggybacks will be your friend in this case.

I made around 400rwhp for less than $1,500 in mods. :)

What Mods are people using AA softwere and or Dinan softwere:help

The engine is a 3.0 liter twin turbo, not a 3.5 liter. There are many ways to increase the HP. Ive seen videos of proceed 335's doing the quarter in as low as 12.2 seconds. Depends pretty much on how much you are willing to spend. This has been discussed multiple times on this forum, you should be able to find out a lot.

I used the Juice Box Stage 2 with HR option, ultimate downpipes, and cone air filters.

The engine is a 3.0 liter twin turbo, not a 3.5 liter. There are many ways to increase the HP. Ive seen videos of proceed 335's doing the quarter in as low as 12.2 seconds. Depends pretty much on how much you are willing to spend. This has been discussed multiple times on this forum, you should be able to find out a lot.

http://www.dragtimes.com/BMW--335i-Drag-Racing.html

I used the Juice Box Stage 2 with HR option, ultimate downpipes, and cone air filters.

Very nice numbers.

I would def look into getting more performance modifications before increasing horsepower. Spend your money on brakes, heavier clutch etc before getting more power as it will be more of a strain on the vehicle.

http://www.e90post.com/forums/showthread.php?t=100630