When I got my dual exhaust installed the box wasn't on the truck so we couldn't locate the tailpipes at the time. My truck is finally done (for now anyways) and goes in next week for the tail pipes. I'm leaning toward exiting behind the rear wheels. Maybe 12" or so behind the wheels? Not sure how close to get to the sheet metal or how far out or what kind of angle or cut on the pipe? or chrome ends? I'm going to tell him to try to keep the pipes up out of site as much as possible as it comes over the axle. I hate it when you can see a lot of pipe from behind the truck. Any advice? Any pictures?

 

The tubes (or fancy polished tips) should project beyond the body line so the bed doesn't act like an echo chamber.

My preference is about an inch so that the bed''s vertical contour flows.

Horizontal location along the bed? Well, the tubing should be behind the rear leaf spring mount so form follows function.

 

I had "Stock appearing" tailpipes put on my '69 years ago when I had a new 2 1/2" exhaust bent for it. I like the look of the stock side exhaust. Never really cared for the two pipes out the back look. Especially with big chrome tips looking all gawdy.



Only side shot is on my video:

Hmm, it was suppose to start at the end of the video to just show the tailpipes. Oh well.

 

My exhaust is completely hidden from view unless your looking from underneath. Over the axle all the way back, with turn downs right behind the bumper.

 

How do the 360 react to a single 3" exiting on the stock location? Never did like duals either.

 

Stealthy. I like it. My 2 dr '64 Galaxie has similar exhaust. Stock location, under bumper in each corner but you can't really see it. I used some 45* turndowns and cut them flush with the bottom of the bumper.

 

Well from what I understand. A single 3 is equivalent to dual 2". A single 3.5" would be a little better if your going for performance.

 

Whant to keep that low end torque, I've heard if you go to big you'll loose low end torque and I don't want that. Right now it has a pathetic 2.25" from the collectors and dumping before the rear axle.

 

That's an old myth. Backpressure robs power. Especially on a boosted engine.

 

I knew that on forced inducted engines is good to have no back pressure aka straight piped (my avatar and obs) but on an all motor application?

 

For an HP range up to 350 HP, dual 2.25s can be merged into a single 2.5-inch tube, and above that dual 2.5-inch tubes can be merged into a single 3-inch system.

Greater than 500 HP combined with higher RPM (>5000), then a dual 3-inch system is recommended.

 

Yep. Although proper tuning is vital. Think about it. What is back pressure? It's the resistance of the exhaust gasses to flow out of the cylinder. That means the cylinder has to push it out, which robs power from the engine, and it won't be able to bring as much fresh air in. Which means less burn and less cylinder pressure, which means less power....

 

The whole thing with sizing is based on horsepower. But the flow of the pipe is based on its diameter and respective area. People often assume that a dual 2" system would be equivalent to a single 4". But if you put the 2" pipes inside the 4" pipe, you would have area above and below them that the 2" pipes wouldn't fill. THAT area, is why bigger single pipes flow more Than smaller duals.

 

I learned something new today, I always was taught and read articles where they said for an all motor application there should be some back pressure to some extent, and when they build exhaust systems they always use some kind of X or H crossover but its way beyond my Knowlege to know what they really do , I've always had turboed cars and always ran straight piped, on my avatar I was running a 3.5 exhaust pipe exiting in front of the front driver side tire. And on my signature truck (The Mule) straight 3 to 4" exhaust makes the turbo more efficient as is a turbo already creates enough back pressure.

 

From my understanding, exhaust performance all starts with how much exhaust gas is coming out of the engine in cubic feet per minute. You want to at least maintain that c.f.m speed all the way out the tail pipe. Slightly faster is better. If the speed of the pipes is too constrictive for your c.f.m flow, you create back pressure. Too large of a diameter and you slow down your flow.

I guess it depends on if you want it to look and sound cool vs. allowing your engine to perform at it's peak. You can have both.