I have Flowtechs (I know they suck) and their Y-pipe is very restrictive. I am looking to get a used dual cat setup and somehow get it to work. I was thinking I ll probably need collector extensions and weld the y-pipes on to them. It would probably hang too low. Another option is to use the Heddman Y-pipe. The parts shop accidently gave me the heddman y at first and it would not bolt up but was close. It would flow a littl better than what I have now. I was hoping someone has did this. If so any info would be helpful