if u dont plan on any modding down the road... id spend the few extra dollars and get a 3 in downpipe. its a cheap mod that has u bend delete and will give a u little more power. there is a chance with having a hi flow cat either way that it will set a p0420 code. some do it and some dont.

http://www.zzperformance.com/grand_p...=551&catid=110