you wouldnt be close to 330 hp without more boost...breather mods ie intake exhaust help out..but wont make that much of a difference on the ms3 motor....id say with your current mods right now your prabaly pushing 40 whp more than stock..maybe 50..which is pretty good..so average stock ms3 goes 220-230 whp..your prabaly around 260-270 whp..and a tune would put you around 290-300. and with a fmic prabaly 300-315...course these number are not perfect..but ball park numbers...so you got good mods right now..add the Cobb accessport and a fmic and get a custom tune..which like i said thats gonna be 300+ whp easily and as far as bolt ons..thats it..minus the turbo manifold..which im not a huge fan on with the stock turbo..the catless downpipe-testpipe is already spooling that turbo fast enough...Honestly thats as much as I recconmend on stock motor.