Quote:
Originally Posted by y cymro
The air filter is unlikely to add much unless you have an effective CAI.
There are manifolds for sale on eBay. Be careful that you're getting the correct manifold and not being conned with a 323 or 328 one. It's not a straight swap as some pipe work changes and a couple of extra brackets are required. I'll post a useful link later.
The increase in power comes with a decrease in low down torque.
A remap will liberate most benefit with the manifold. All the above together with an M3 exhaust manifold will give you 240bhp.
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Correct, I may have been a bit nonchalant there but having modified many engines I call that straightforward for the power increase. Naturally you need CAI but I thought that went without saying.