Silver_Truck

Has anyone tried taking an extra right side exhaust manifold and putting it on the left bank and running dual exhausts back from there? I know there would probably be some cutting and welding required which is not a problem. I'd be looking to clean up the manifolds then build straight pipes back to a y-pipe/crossover pipe where I'd mount the cat then probably a close coupled muffler (has anyone tried that before?) then run dual exits out of the muffler. It looks to be a pretty decent solution on the expensive exhaust issue for the 3v. Thanks guys

Ilovemountains

I saw an attempt at this last year. A friend at an auto shop took a spare manifold and cut the flange off and made his own "header". He was able to put the new pipe in the flange and put it in the pipe expander and welded it up, it looked ok but where it collected was not pretty. I think he scrapped the idea for a set of Downeys but I’m not sure. I will give him a call and see if he still has that proto type in the shop or if he ever did try to finish that up. Basically he was going to block off the cross over hole on the drivers side, use his "header" for the passenger side and make a new Y pipe. I don’t know if this would work or not, I guess it could,,, I wish I had access to a pipe bender and expander, I may try to make my own!

Silver_Truck

k cool let me know what you find out, I'm planning on bending up some tubing to bolt on to the flange at the back of the manifolds and run it down and out of the engine bay before crossing over (probably after T-Case) then put the cat, muffler then pipes coming out from there

Cebby

If you just eliminate/reroute the crossover pipe, that will give you decent results - AND no header rattling....

Yamaha+Toyota=Fun

What would you do with the o2 sensor if there was no crossover?

Greg_Canada

What i'm going to do is remove the crossover and route two tubes with a y-pipe near the t-case/tranny.

Cebby

Me too - in stainless!!!

Yamaha+Toyota=Fun

What I meant was what if you had no y-pipe/crossover at all. Just have each pipe from the header go straight back. Have 2 cat, 2 mufflers(dual exhaust).... what could you do with the 02 sensor?

Silver_Truck

dual O2 sensors? dunno if the ecu can read that though. I'd have a crossover so i'd just mount it before the cat like normal just a little farther downstream