Flowmasters are loud and they drone you out of the car at cruise! 
Flow- Masters
Thread Starter
Burning Brakes
Joined: Apr 2013
Posts: 1,057
Likes: 47
From: Saint clair shores Michigan
Flow- Masters
What do you guys think about flowmaster mufflers. There very loud, I don't really mind that.but are they really worth the sound? Are they really adding that much more power?
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
Melting Slicks
Joined: Sep 2006
Posts: 2,789
Likes: 464
From: Wichita Kansas
I put up with series 40 on my stock exhaust for a couple of years, then installed magnaflows. Never regretted it. Much better, not so loud, not such a tin-canny sound like the flowmasters....
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Instructor
Joined: Mar 2002
Posts: 248
Likes: 41
From: laverne ca
Different car 70 chevelle 396 headers had 40 series flow masters , way to much drone changed to 50 series delta flow flow masters much better, no drone to speak of still loud but i can live with it , sounds like a muscle car the 50 series have three chamber baffles in them . .
Instructor
Joined: Mar 2002
Posts: 248
Likes: 41
From: laverne ca
Went with cc n11 on my 66 350 hp , did not think about magnaflows at the time,i like the off the road exhaust on my 66 it sounds like what it think a corvette should sound like, exhaust is a personal thing don,t know if there is a right or wrong answer, my 70 chevelle is loud but i think it fits the car for that era.
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
Flowmasters have an interesting sound, but the more commonly used ones are not the best design for flow. Magnaflow types (which include Dynomax Ultra Flows and the Borla Pro XS that I have on my car) are a much higher flowing design and actually tend to be a little less drone-y vs Flowmaster 40 series.
