I have been restoreing my car and slowly aquireing parts for my car. Im getting close to painting my car and after that is exhaust. I have a custom 4" DP back ready to go but now Im starting to wonder, which down pipe should I use. I have a kirban dp, 3 stockers, and a GN1 that has been modded to vent the wastegate to the atmosphere. I just picked up a heavy duty wastegate for my stock rebuilt turbo and have been wondering which way to go. My options are either put the kirbans on and hope it dosent leak, spend the money on a terry houston, or buy an external wastegate and run that. I know I dont need an external wastegate but I would love to hear how loud it screams when it opens up...Any pros or con or opinions on my options feel free to chime in. Also let me know if you want any other information.