Feeling slower won't be because of AWD vs RWD, but simply that the Silvia's are smaller, being modded, noisier, probably stiffer etc, "noisepower" is a massive part of how quick a car seems. My mates 180 has always felt HEAPS quicker than my 32, but when I was running 12.7, he ran 12.5.. As Ten Four said though 33s feel slower again, my mother (yes, really) has a 33 with -7s, PFC, Cams, Cooler, cam gears it's lowered and heaps stiffer than mine (mine has -7s, exhaust and filter) yet mine feels quicker... As an R32 fan though, Buy a 33.. They are a far better car, and Shedloads better value than 32s.