older single cat y-pipe onto 98 Z71???

[big72red]

Hi guys. Haven't been on here in a while, but you're always helpful. I recently was involved in a wreck totalling my 94 Z71. I purchased a 98 as a replacement vehicle. I just bought a Magnaflow stainless catted y-pipe and Dynomax cat-back exhaust for my 94. Literally only on the truck for a week. My 98 has bad flanges, leaky doughnut gaskets, and a terrible hack job of deleting the cats.

So...could I use the existing pre-cat 02 bung in my Magnaflow y-pipe for the right bank sensor, and weld in another bung in the left bank downpipe for the other pre-cat 02 sensor? Would this allow me to use my 94 y-pipe on my 98? Then for the downstream 02 sensors. Would it be alright to place 2 bungs in the single 3" intermediate pipe from my 94 cat-back? I hate to let all this brand new exhaust go to waste, if I can salvage it for the new truck. Thanks in advance y'all.

[big72red]

*bump* Nobody has ever swapped from the duals to the muffler to a y-pipe single exhaust back to the muffler?

[Tom]

Originally Posted by big72red

*bump* Nobody has ever swapped from the duals to the muffler to a y-pipe single exhaust back to the muffler?

Highly doubtfull. Nobody goes backwards in performance. If you have 2 different pre-cat O2's giving different readings and then the rear O2's giving the same the truck might freak out, not sure. I wouldn't do it personally.