Im planning to get this exhuast but i was wondering what size to get? i have a 2006 rsx type s and i will get a dcrh and ingen cold air intake with k-pro. should i get the 63mm piping or the 70 mm piping? 63=2.5inch 70=2.27inch.

 

hmm how come the 70 mm is a tad smaller than the 63 mm? i say u get the 70 mm looks sexier too hehe