Uhm nope... haha im no exhaust sifu bro, only a noobkia in tuning cars, I just like driving around
Personally i'd just do the usual, 2.3/5" piping, change extractor and muffler but I might be wrong also, so I guess you can lepak at the proton section and ask around?
Never heard R.O bro, but I dont think its that bad either haha. Nowadays Cap Ayam stuff the quality is getting better...