i just bought the cobb accessport cuz i dont wana be cheap i hear the jb4 is good but it tricks your engine rather than actually tune idk i might be wrong but thats what i heard
I have a mk7 gti that has a type s catback borla exhaust i want it to be louder and i was thinking of the cts catted dowpipe but im not sure if i need to tune my car after and if i do what tune do i need for just those two parts everything else is stock