Interesting article on mufflers

[Wild one]

Magnaflow vs. Flowmaster, Who Makes the Best Muffler?

Is a Magnaflow or a Flowmaster muffler the best? We dig deep into the question and get some help from an Engine Masters $40 Muffler Dyno Test.

www.motortrend.com

 

[HEMIMANN]

That's weird - an EM episode not long ago tested different exhaust emissions, concluding there's little difference in power with varying restriction. The only significant improvement was long tube headers and collectors.

 

[Jwithing]

"If backpressure really added torque, the names Flowmaster and Magnaflow would instead be Chokemaster and Magnachoke."

That article reminded me that I need to wrap my headers lol.

 

[blackbetty14]

Smaller exhausts promote scavaging which does have higher back pressure do to the smaller DIA and higher exhaust velocities which causes it to be a restriction at higher RPM or HP as it can only flow so much before becoming a restriction and increasing back pressure.

I usually always try to run the biggest exhaust I can with a merge (usually always an Xpipe) and a straight through perf core muffler for max flow. I stay away from crapmaster chambered mufflers and all others.

Wrapping the headers is usually always good and cheap but if u have ever had to deal with wrapped headers it’s not worth it lol. I now do my own ceramic coating (air cured creakote) and don’t even bother wrapping anywhere near where I need access or would have to work around.

I remember a test over a year ago, and the perf core was worth a solid gain over a chambered and a super turbo style muffler. I also saw where they dented a primary in half and it showed almost no HP loss.

Best I can say is design the exhaust around your power goals, RPm range and where you want it to be most efficient.