The Power of 2.5- vs. 3-Inch Exhaust. Is bigger better?
You’re sitting around with your typical street/strip V-8 and wondering, should I get 2.5-inch-diameter exhaust pipes and mufflers, or should I go 3-inch? In this episode of Engine Masters, presented by AMSOIL, we will help you decide, giving answers about power, tuning, and weight on 2.5- and 3-inch systems. You’ll also find out about a very simple combo for 600-plus horsepower from a 454 Chevy! Finally, thank you to our new supporting sponsors, Mr. Gasket and Earl’s Plumbing!
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17 thoughts on “The Power of 2.5- vs. 3-Inch Exhaust. Is bigger better?”
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Only if your flow from your headers or manifold is ment for it. Sometimes not enough back pressure is bad
Yep, gotta meat the demand
Awesome
se Jan Steiermark jeg havde ret
Not always true… depends on alot of various conditions…
3 inch exhaust with turn downs right after the mufflers !
That’s a 600hp motor. I killed my stock crown Victoria which only has 240hp by putting big pipes on it.
2.5 low rpm torque versus high rpm power
I have a stock challenger rt and have been wanting to put magnaflow to give it a good sound. But thats it. Any suggestions?
Good choice. Great “sound” ( not raspy and actually gives a decent power boost on these cars) I think it actually gives a 20-30 hp gain without having to “reflash” the computer, plus it shaves 30-40 pounds of weight which on a new Challenger is nevr a bad thing.
2.5 or 3 inch pipe??
I saw a show on TV ( not sure if it was “Engine Power” or on of the others I watch. It was on about 2 or 3 year ago and was on a 2014 or earlier Challenger ) I think, just remember it was the year it made around 425 hp) actually believe the “Catback” system shaved more like 40-60 lbs and the hp gain may have been at or just beyond the 30 hp that I stated with a similar increase in torque. They may have also added a quality cold air intake system, but I’m pretty sure they d it in stages and the cat back system alone made more hp an saved the weight. It was a while ago so I’ not sure of the numbers but I do remember it wasn’t the 6-10 hp some system make, and the newer cars have almost that kind of hp already but the stock exhausts are notoriously heavy and a bit restrictive. Have you tried the Magnaflow website? Punch in your year and I’m pretty sure they have a dyno chart that shows what the difference would be.
Thanks..
I had 2 1/2″ on a 454 in my 77 Malibu turned out behind the tires with 3 chambered Flowmasters it went 12.84 … later I put on 3″ exhaust with 3 1/2″ race Flowmasters turned down in front of the rear end it went 12.48 first pass and later went 12.20s.
3″ it is.
I didn’t need to watch video to know that answer..that’s been old news a long time
WALLY