Kooks LT with Jet Hot y pipe
Example Kooks long tube with 3 inch collectors to a Jet hot Off road Y pipe 3 inch.
1. You wont have a floorboard banging pipe.
2. You get what you want.
3. You can have slip fit or flanged. (Flanged is easier to work with IMO)
4. No shipping on a big box.
5. Sometimes cheaper.
To answer your question though: Some off the shelf y's work with some setups and some dont. In some instances people get a Pacesetter Y-pipe and headers and they dont hardly fit at all. Sometimes its a glove fit and you would think they were destined for each other all along. People do get lucky. Better safe than lucky though. Price may be cheaper if you factor out shipping costs in the end.

