I have a 156 1.8 which I have just added a K&N 57i kit. The car now feels more like the vehicle I hoped I had bought 2 yrs ago! Can anyone tell me what else I can add for more power?
A remap of the cars ecu will gain about 10-12 bhp.
Also a free flow exhaust system with a de-cat pipe will free up about another 5-8 bhp depending on the exhaust system you opt for and the engine condition itself.
Then for more power you can get fast road cams and then you are getting into serious tuning like modifying cylinder heads and engine internals and then theres turbo/supercharging the engine.It just depends on what sort of power you want and how much money you are willing to spend.