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Originally Posted by aschon
thinair - I'm just saying.. BMW's respond really shitty to bolt-on's.. it's almost a waste of money to mod them...
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So what you're saying is that BMW properly designed the parts that came stock, and that aftermarket companies don't have much room to improve on.
I don't think you understand how much faster a 328 and an M3 gets with a shorter diff, cams, manifold and software.
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Originally Posted by BennyL
so does anyone wanna explain to me what each of these is:
3.15 LSD, M50 Manifold , Fan Delete Mod Kit, M3 Catback, Stock Airbox Debaffle + K&N
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3.15LSD - a differential with a 3.15:1 gear ratio, and has limited slip (Limited Slip Differential) so power is forced to both wheels. Stock on a 328 is a 2.91:1 gear ratio. This mod only really applies to 325 and 328's.
M50 manifold - the intake manifold on the M52's is restrictive, so many people swap in the manifold from the M50 engine (325, 525, 95 M3) into their 328's and 96-99 M3 engines.
Fan Delete Mod (FDM) - this modification removes the radiator fan that is bolted to the water pump, relying primarily on the electric auxilaury fan and a cooling system that opens the coolant to the rad earlier. The engine fan requires about 3-5hp to be turned.
M3 catback - a stock muffler from an M3. It's called catback because it's the entire section that bolts onto the catalytic converter and exits at the rear of the car.
Stock airbox debaffle + K&N - there is a noise baffle inside that stock airbox that can be removed for improved flow, the side effect is more induction noise, which is good or bad, usually depending on your age
. K&N is a company that makes reuseable cotton air filters whcih claim better flow then stock paper filters.