I seen a picture of a dual exhaust on a I6 without moving the gas tank. I'm going to attempt to do my first system, and I'd like to have a picture to look off of. Anyone know of or have that picture?
take a coat hanger and bend it the way you want the exhaust to run then bend your pipe the same as the coat hanger
not to try and dissuade you here.. but for what purpose? what expected gain? and at what overall cost in weight increase? nutshell time. the little gain in airflow capability.. mainly due to the second muffler being added.. is very easily overshadowed by nearly doubling the exhaust systems weight in such an rpm/airflow/torque limited application as this one. What size 6?.. the bigger.. the better any potential gain to be had. Of course, when we had much lower flowing factory exhaust plugs for mufflers.. and even the old style "Corvair turbo mufflers"?.. sure.. ganged mufflers(2 per exhaust manifold bank) were of some benefit in heavily restricted applications. That will not be the case here if you simply design the single system to flow more exhaust mass up to and only slightly beyond the engines ultimate flow requirement. Any more than necessary typically just results in minor to naught improvements in reduced pumping losses and takes away from low speed torque and throttle response that taller geared street cars thrive on. Even very mild stock cams can benefit from increased pipe velocity so long as pipe sizing doesn't become a major restriction. Also, an improperly designed Y-collector can and often does shoot these types of "planned gains" all to hell too.. so there's that as well. If you're going to do this type of mod?.. and I would probably not suggest it at all these days.. using mandrel bent pipe absolutely no larger 2" per bank(although mufflers can and typically should be larger than the feed pipes diameter) would be mandatory to flush out any possible gains for enough power to outweigh this now higher curb weight. If you're using compression/crimp bends?.. the size will need to be slightly larger than optimum to overcome the added restriction in the bends and transitions. IOW's.. You'll help matters in 5% of the system by increasing pipe diameter(removing the crimp bends added restriction).. but you'll lose much of that gain with reduced exhaust velocity in the other 95% of the system.
Classic Inlines has some interesting information on the I6 exhaust systems. Kits like the “Arvinode Dual Exhaust” could provide some insight for what you trying to accomplish. Match that with their dual outlet header and I bet you’d have exhaust set up. http://classicinlines.com/proddetail.asp?prod=WAE-200-ADS
Back when I had a six banger in mine (1973) I had an over-sized Thrush glasspack and then a Y pipe into dual tail pipes. Didn't sound too bad, not like a V8, but not too bad.
I had read up on classic inlines and that was the system I was gonna go with. But it was too expensive. I was gonna buy their header, and do the piping, because I work at customs by Kilkeary,and I can do the piping there. I'm not looking for much, maybe alittle power but it's more for the sound. Not to sound like a v8 but better than the stock system with a glasspack in place of the original muffler
