The Stovebolt Site Forums The Shop Area Engine Shop Dual exhaust routing

Last night I finally mounted my split exhaust manifold on my 235 with Fenton intake and dual Rochester B’s. I had a short pc. of pipe and was able to run the front outlet down by the oil pan. I only started it for about 30 seconds but the sound blew me away. I’m taking it to the exhaust guy this afternoon for the dual mufflers/pipes. He suggested oval performance type mufflers with pipes straight out the back. I’m wondering the best place to cross over to the opposite side. He said the area looked good under the tranny but he didn’t want to block it. I told him the tranny comes out thru the cab so the pipe wouldn’t be in my way there. I don’t want to be too loud but I want the distinct sound noticed so I’m unsure of mufflers too. Anybody have suggestions on routing in an A.D. application? Thanks for replies.


Curt B.

Curt,

Performance mufflers can sound pretty good. I tend to prefer glass-packs.

Something you might consider, rather than routing the pipes straight out the back, would be out each side, to the edge of the rear fenders.

If you're burning rich, or any oil at all, routing the pipes straight out the back can at times put soot on the back end of the truck or bumper.

Also, if you have a rear bumper, in my opinion, it looks a bit strange to have two pipes sticking through the space between the tailgate and the bumper.

I don't have an example of an AD, but here's a link to a pic. of my 46 showing the tips where I'm suggesting.

http://groups.msn.com/JedsToyBox/shoebox.msnw?action=ShowPhoto&PhotoID=11

Hey Curt,

I ran mine straight back, over the diff and out the back. Check out my pic in "Shoebox" (pg 8,9,10)that way you'll get an idea what you do or do not want. I liked to keep the tranny area clear and also have room for my hitch.

I used "Cherry Bomb" glasspacks....nice mild rumble up to 2200 rpm. After that, folks start grabbing their kids and ducking for shelter.
However, with good cab insulation cruising at 65-70 @ 2100 rpm's is comfortable. Hope this helps you with your decision.

I did the one/in to collector/two out deal with one muffler under the cab. Sound is nice but sedate, just the way I like it and routing to the rear was easy with nothing in the way. This simplifies things IMO. At least it's another thought.

I ran my pipes straight out the back with Smitty mufflers. Sounds great.
I crossed over just behind the oil pan ahead of the fly wheel. This gives you access to the transmission and clutch assy. in needed. The only time you might need to disconnect the pipe is if you need access to the lower end of the engine or to drop the oil pan, and how often is that nessary?
Just more to clutter your decision. Hope it helps.
Tom

I have a Patricks dual in/dual out in the same spot as the original muffler. The tail pipes run up and over the differential and straight out the back, just underneath the bumper, on either side of the hitch. A nearby muffler shop did the whole thing (my muffler) from headers to tail pipes for $300. It was AWESOME driving it to the shop running straight out of the headers. A couple of kids in a 67-72? drove by and gave the thumbs up. I let em roar a little bit
Now that it's done the sound is great. Nice and quiet at idle and then it really sings a nice rumble at 2500-3300rpms. And going sraight out the back it's even quieter - at least for the driver!

Thanks guys. It's in the shop now and he's going across just in front of the tranny crossmember and then 2 oval preformance mufflers hung where the original mounted then symmetrical straight out the back 1" below the rollpan. I made a small rollpan just to cover the frame and no bumper. He noted the original saddle type steel mount was solid. He said that would cause a noticeble vibration which will now be gone with rubber mounting. I've driven it that way for 4 years so I'm curious about that. Driving it with the front 3 cylinders open was like driving 3 harleys at the same time. The 235 was instantly a scary monster. I have to ditch work today and go joy riding when he's done.

Curt B.

I'm gonna exit in front of the rear tires when I do mine.

I've always thought that both coming out in front of the rear tire on the drivers side THRU the sidepanel with a nice bezel for trim would be cool.

I have Fenton headers, 2 1/2" back to turbo mufflers and drops to 2 1/4" in the tailpipe. Both tailpipes are together on the left side, to let people know it's not a V-thing, but an inliner!