Originally Posted By Hugh Jorgan
I was told that its the manifold and cat that make the difference with regard to bhp.
The rest of the system, although it has some effect, less important.
If the rest of the system is ok, save your self some money…..

Together with a K&N air filter and an ECU fine-tuning the car is much better now.
5th gear makes sense now too. Some 25 more bhp.

Hannes
once: Green M3W; 2013
now: Red 4/4 Sport; 2011
and some practical cars for use in real life