Join Date: May 2015
Location: Wirral England
Vehicle: slc 43 2016
Mentioned: 6 Post(s)
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Quoted: 86 Post(s)
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If you search the subject on the forum you'll find the answers in greater detail , but a short version is
I installed the crank over pulley alone and it makes a big difference to torque and low down grunt . I had sacha download the new map to my 2002 230 whilst I was in Germany and it smooths out the power delivery a lot and gives a better top end .
After that I put on a bigger intercooler , no discernible difference , and butchered a cone filter onto the inlet side and fed it with as much cold air as I could and also fashioned a heat shield to protect it from engine compartment heat , this seemed to make a small difference to performance and a lot more intake noise .
I thought about an exhaust manifold but the e bay ones your probably looking at are poorly designed in my opinion. As for porting and polishing you'll be lucky to realise another 10bhp on top of the pulley and map and it'll cost you .
Personally if I did it again I'd go pulley , map and free flowing air intake , and a better exhaust system . If you want any more out of the car get rid of some weight with seats etc and some suspension upgrades .