currently driving 2002 m3 smg. thinking of swapping into a 2003 sti.
From what i've read so far the mods to start wtith would be the exhaust stuff,
ie removing the cats. Then fueling ie bigger injectors....bigger pump.
then if u must, a show off valve...i mean bov
question is : where will these mods get me power wise ? I don't want to be
going backwards. m3 is 252kw and does 0-100 in about 5.2s