do mufflers rob HP
05-10-2010, 06:45 PM
#2
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a restrictive muffler will create more backpressure, which does not let the engine breathe as well, thus resulting in less horsepower. it's not so much the flowmaster that robs it of HP, it's the fact that the muffler doesn't flow well.
05-10-2010, 07:41 PM
#5
The Flowmaster is great for sound but poor on the flowing side. I'm sure it holds back some power being I just took mine off and swapped on a Magnaflow Muffler and it feels more responsive. Flows much better and much more quiet. If you want my Flowmaster it's yours..lol 
05-11-2010, 01:17 AM
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Any muffler is likely to rob some level of power over a straight pipe (some may only be 1-2hp though).
If your question is whether a Flowmaster will rob power over a stock muffler, then the answer is no. But, if you're asking whether it will rob power over a straight pipe, then the answer is yes.
The Flowmaster crossflow design that's used on the F-bodies certainly isn't the best flowing muffler on the market. However, their non-crossflow mufflers are a better design.
If your question is whether a Flowmaster will rob power over a stock muffler, then the answer is no. But, if you're asking whether it will rob power over a straight pipe, then the answer is yes.
The Flowmaster crossflow design that's used on the F-bodies certainly isn't the best flowing muffler on the market. However, their non-crossflow mufflers are a better design.
