Agree - mods above fit e36 only. (even after won't be the same as 330ci)
Not much you can do cheap.
Cat back exhaust incl. manifold - good custom.
Good air filter intake kit plus fresh remap.
Is it worth it? Don't think so. Just nice sound but lower mpg.
Buy M54B30 - it does make a difference from bottom revs.
A 328i with m50 manifold fitted will make around 208-212bhp on a dyno dynamics rolling road with or without bbtb fitted (see 1st dyno graph)
but will have a flat spot before 3500-3700 different software can help the flat spots
A 328i with m50 manifold fitted
Standard air box fitted
Will make 230-235
Cold air induction kit fitted with above mods will make 235-239bhp
A e36 328i with
m50 inlet manifold fitted
m3 exhaust manifolds and full system
Standard air box
No remap will make 220-224bhp
With our remap will make 240-243bhp
Standard air box holds back power
With cold air induction kit our remap makes 248-252bhp and revs up much faster
See pembo's 328i
328i with m50 inlet manifold
Air induction kit
USA m3 cams
Our remap on t1000's car back in 2006 made 263bhp there is loads of room for improvements in the mapping on this car still
After Morgan t1000 fitted m3 exhaust manifolds it lost power on this car (will need retuning to suit m3 manifold set up)
I've found that m50 manifolds that have been fitted using hose pipes and the 90 degree pipe connectors(take longer to install but alot cheaper)have made the same power as the machined m50 manifolds which are a nicer fit and easier to install
Bbtb fitted have made no difference to a remapped car but have helped throttle response on cars with no remap installed
Standard air box is good for up to 230ish bhp
Cold air induction kit like Dave F or Simota helps car to rev up faster and more bhp on cars after 230bhp with m3 exhaust manifold and full system fitted
You may need to shorten the lamda sensor mountings on the m3 exhaust manifold so the lamda sensors fit further into the exhaust gas stream
With this mod and the m50 manifold you would be looking at getting 250bhp
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