not only HPF kits are faster than 335i's chipped/Intake/DP/cat del. there are other SC companies like VFE stg. 2, AA GTS, and ESS VT2.

 

seriously hpf stg 2.5 and your done. only reason to go higher then 2.5 would be because you have a guy with a veyron racing you everyday living next to you :rofl:

grats on the decision GL with a NA build if you do go that route i think one person has a 3.4L but his car is boosted as well so not sure what gains he made NA, think he is making about 620 atm.

 

I can't imagine what that much HP would be like in an E46. My 135i with just a tune is already way too fast for the street. No where to use it.

 

Bored and Stroke is a very ambitious first mod! Try doing the bolt on's first or FI