hello TT.net and the rest of u fine people .First I want to thank everyone cause I had no idea on how to do the swap till I found this site and everyhitng can be found ...but my question is I did a tt swap in my NA and used the jdm stock downpipes so it fit right to NA exhaust but now I want to get real downpipes maybe megan racing idk I not into track and all that just a little something extra to it but if I do DP do I have to get new exhaust pipes ? or if I leave the jdm dp and just eliminate cats can I use TT test pipes or are they differendo I need TP from a NA? hope it makes sence