...for my R32. It's 12am at nite, been up since 6.45am, I'm knackered and I can't seem to find where I can buy a 4" zorst for mah R23... sorry, r32 (using the search facility). I know the Apexi N1's (GT?)are 3.75" in diameter but I'm after a true 4" system from d/pipe. Anybody now where I can buy one from?