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bingo.
Don't really bother with an exhaust and filter unless you want a bit more noise.
You're buying the wrong car if you want to tune, optimisticly you might get 10 hp from matched inlet manifold, panel filter and decat, but remember they very rarely make the standard 169 horsepower...
Kev made 200.1bhp at rs tuning with inlets, cams, map and exhaust.
Think the overall gain was around the 15-20hp range, i'm sure he can tell you what the story is!
Lol at everyone defending the M3.
Who cares??
The M3 is an absolutely awesome car, but in this instance the clio was quicker (for a while).
The real world says so.