Originally Posted By: SteveSRT8
Originally Posted By: code5coupe
Originally Posted By: SteveSRT8
Some engines love back pressure. Helps keep their torque curve up.
Old wife's tale. While engines will run with lots of back pressure, there is a cardinal rule: less is more.
NOT old wives tale, well documented on dynos and drag strips across the country!
No blanket statements here. One engine may like a free flowing exhaust but another design may not. Too many variables in engine design and application prove you incorrect.
agreed. years ago I had a '70 Nova w/ a mild 283 that I tried driving around for a few days w/ no exhaust, just open headers; NO low end power, would bog off the line.
I installed a full flowmaster exhaust, 2 1/2" pipes, crossover tube, w/ one big muffler over the axle.
it woke the car up big time! lots of low end grunt, pop the clutch and launched hard! and of course it was MUCH quieter.
back pressure is all about being well designed. the flowmaster system efficiently scavenged the exhaust, not just dumping it out faster than the engine could breathe.