Whats the best way to increase bhp on a bmw 318is?

Answer 1

Downing Atlanta has a custom built supercharger kit exactly for your engine, the M42 (that's BMW's codename for your engine).

See details at:
http://www.downingatlanta.com/da_superchargers_info_new.htm

It will make your 318is outperform a 328is.

Don't bother adding cheap loud exhausts that would do little more than wake up your neighbors and kill the refinement of your BMW.

This kit is great because it will boost your power without adding any additional noise. It also would let you retain your original fuel economy when you're not using it by having a bypass system.

Answer 2

Start off by doing a ECU remap or installing a performance chip , then performance echaust , performance k and n induction kit cold air, ultimately you should aim for a supercharger this will massively increase your bhp from 147 probably up to around 250 , but it is expensive, forged pistons upgraded seals , and so on

Answer 3

Cold air intake, freer flowing exhaust, performance chip