Home Forums Hunting & Shooting Hunter's Campfire Is dual exhaust becoming obsolete?

nope.

New Ram trucks come with it. Hell, lots of new cars and SUV's come with it. My wife's Honda Pilot has it even and there is nothing high performance about that rig.

Go look under your truck. I'd bet it even has 2 CAT's, then down to one tail pipe.

Correct on more now than previous.

Dual exhausts- - - -a solution to an nonexistent problem. Stupid people who want to destroy their own hearing and everyone else's for half a block around demanded loud, obnoxious exhausts and the factories complied for a time. 30-something years of doing dyno runs on NASCAR racing engines that cost more than the average blinged-out 4WD redneck chariot have proved to me that dual exhausts on a street machine of any kind are about as worthless as balls on a priest. Noise is not horsepower.
Jerry

I was talking about old vehicles.
So back at ya

I'll go buy one off the lot when daddy leaves me a farm and 83 sakos

Fixed.

I was following a new Subaru the other day and was looking at it at the stop light. As previously mentioned, the exhaust stopped at the rear "differential", if that is what you would call it on that crappy little car. Anyway, I was wondering who will be the first to croak from fumes with a set up like that...assuming lesbian cars still produce carbon monoxide.

Has nothing to do with it. Air flow can be improved as easily with a single large diameter pipe as 2 smaller pipes. Single mufflers are made to flow much more than mufflers of the 70's.

It was found along time ago in the fire service that a 4" water line flowed more water with less friction loss than 2, 2-1/2" lines. The same principle applies to air. Mandrel bent tubes reduce air drag too. Many cars now days produce higher horsepower with less emissions and better fuel economy than just 20 years ago.

With over 4000 flying hours in a C-130 and nine years on the flight line quiet is preferred.

My 2919 Silverado is dual exhaust and my 2016 is as you described.

Agreed. Got the same setup on my TRD PRO. First time my 81 YO FIL heard it he grinned from ear to ear. “Purrs real nice, doesn’t it,” he said.

Wife’s got one of those funny little BMW commuter cars (what I call them.” When she first got it I thought it was funny, little 4 cylinder with dual exhaust. Finally one morning I noticed the exhaust only comes out one pipe. Light bulb went on over my head, “I’ll bet that other pipe is intake.”

My bud owns a parts house and one day a kid with his new truck comes in and asked if he could get him a new exhaust system.

He wanted to make it a lot louder.
Thing is he had twin turbos and that system would not do anything like the older trucks.

Even with no pipes past the cats.

I ran aftermarket exhaust systems on all trucks before my current 2012 Tundra. Wife always said she could hear me coming 3 blocks away after work. Just got to the point where I wanted quiet. Don't have to run the stereo as loud any longer. Now if they come out with a flat plane crank V8 in a 4x4 truck it for sure would have twice pipes .

Not when you run them off headers instead of a factory manifold.You have to retune the computer for the optimum gas to air ratio for dual exhaust.

Back in the 60’s when the factory was using cast exhaust manifolds you could add a little horsepower with headers and dual exhausts. Today it’s just for looks and making noise, you’re not going to improve the performance of a modern computer controlled fuel injected engine by having Billy Joe Jim Bob down at the muffler shop put on duals and glass packs.

Except the little rice rockets, those little bastages oughta be choked down to tolerance levels. I hate the little cars pretending to have big motors, by rattling down the road and annoying everyone else.

I've read and been told that too large an exhaust system was as bad as too small an exhaust system as far as power. A proper sized exhaust for the engine needed a certain amount of exhaust velocity to properly help evacuate exhaust gases from engine for peak power and emission performance.

You need a certain amount of back pressure for best performance on the street.

Good example with my Harley on the dyno. First pull was with open headers. Made the most HP on the top end, but "suffered" on the low end. Adding the baffles lost on peak HP, but moved the torque band to the lower RPM range where the majority of your riding is.

I got to calculating the area of a circle after CashisKing's 4" Cummins comment and then Smarquez's fire hose example. A 2.5" diameter pipe has an area of 4.909 square inches or 9.818 square inches if you had two of them. One 4" diameter pipe would have an area of 12.566 square inches. I just had to go look under the Denali (yeah, she got her two tail pipes) and there is one catalytic converter, one muffler and two pipes behind the axle into secondary mufflers close to the rear bumper. Probably all those two pipes are doing is doubling the soot on the bumper out back.