VANOS is essentially a more complicated version of VTEC, around 4K is when the VANOS switches over. So it's more pronounced with the cams but the M50 manifold is much more aggressive in the top end of the RPM band. Larger runners flow more air as the engine winds up. Yeah, same 15s, I've never found another set for sale. I wanted to run a 225/50-15 or 235/50-15 but it will contact the fender too much without going to flares. I was a little apprehensive to do the 3.07 before I did but I've been running it since before the swap and it's been great. I just have different reasons for why I chose it, in my case I don't need the outright acceleration I need the speed within the gears. __________________ ~Dave~ 98 328ti Morea Grun slicktop 11 128i space gray slicktop 13 JGC WK2 Deep Cherry Search | RealOEM |