Flowmasters.....how bad?

**1Fine69** · 05-02-2006

I have heard from multiple places about how bad the flowmasters flow and how much they decrease hp. Im thinking about just changing out my mufflers but i dont know what to go to. I have 1 3/4 inch headers and and the pipes are 2.5 all the way. What mufflers should i go with to get the best flow, horse, and sound?

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**andrewb70** · 05-02-2006

Dynomax Ultra-Welded

**rocketman** · 05-02-2006

i don't know how a flowmaster hurt's flow.there the best hp muffler out there,i have seen engine where they actuall MADE horsepower.i would leave them

**CAMAROBOY69** · 05-02-2006

I also havent heard where flowmaster reduce flow. Mabey I didnt get the memo but I have always thought highly of them. One of the only few mufflers that I think you can literally run over with a car and it wont even dent.

**1Fine69** · 05-02-2006

yea trust me i know....when i lowered the car i had to chop the inlets and outlets 1/8 and also the pipes......it took hours haha. its wierd people on ls1tech and other various sites call them "slowmasters". i dont know how i get such different varrying opinions

**1Fine69** · 05-02-2006

i just realized what the problem is. cross chambered flowmasters suck. I got single in single out. everybody says those are great

**zbugger** · 05-02-2006

Yeah, the crossflow style is good for ground clearance, but not the best for performance. At least that's what I've noticed. It also depends on engine variables as to whether you'll lose performance of not. They don't flow the "best" of all the mufflers, but for what they are, they can increase your performance.

**rocketman** · 05-02-2006

the crossflows on a camaro are good for bolt on,but not much past that.NO crossflow is that great with alot of horsepower.

**rocketman** · 05-02-2006

my 37 coupe run run 7's threw flowmasters must not flow to bad.

**speedster** · 05-03-2006

Not being a pain, but you don't build a company that successful with products that suck.

**1Fine69** · 05-03-2006

you may runs faster than what you re running. seeing the dyno sheets of cars gaining hp when getting rid of their flowmasters made me nervous. i just had to look into it more and realize that there are different mufflers for different applications. My application would be getting as much flow and hp as possible. Some people already have enough!

**Steve68** · 05-03-2006

4th gen Ls1 cars, there are better mufflers, reg cars like ours there fine

**gearbanger** · 05-03-2006

There was a guy over on another forum that put out a CD of exhaust system sounds on a pontiac 455. He mocked up each system in the floor and ran it at different RPMs and reved it a few times so you could hear each system. He tried probably 30-40 different sets of mufflers. He also tried each set of mufflers with and without an X-crossover. He also flow tested each muffler to test the resistance. The flowmasters didn't so to well on the flow test. The dynomax super turbos actually flowed better than a straight piece of pipe and the dynomax ultraflow welded were right up near the top as well. If you are interested in the CD, Tom Hand is the guy and he hangs out over on the Performance years forum occasionally.

**baz67** · 05-03-2006

Originally Posted by speedster

Not being a pain, but you don't build a company that successful with products that suck.

Yes you can. Just look at Ford.

**1Fine69** · 05-03-2006

that cd sounds great. the videos on ls1tech are great to listen to. i just dont feel like taking more stuff apart.....i feel like f'n getting my car on the road! i hate school

**speedster** · 05-03-2006

Originally Posted by baz67

Yes you can. Just look at Ford.

**bobbaganoosh** · 05-04-2006

Turbo cars can lose power with a chambered muffler, but with n/a cars the hp difference between different performance mufflers isn't a whole lot.

**Drewhelm** · 05-11-2006

The guy who did the testing was Jim Hand. Flowmasters did not flow very well at all. For this reason I am replacing mine with a set of Goerhlich Xlerators.

Drew

**Drewhelm** · 07-03-2006

Here's the new sound....

http://video.google.com/videoplay?do...55939939894487

**rocketman** · 07-03-2006

Every exhaust company say's there's better,I was at Des Moines Goodguys on Saturday and Dynomax had there trailer with differnet mufflers and there mufflers by having a vacumn suck air threw the mufflers to show how bad everyone else is.Whats it prove nothing.

One car make react differnetly with differnet mufflers,Turbo and blower engines don't need alot of muffler to make horsepower or torque,as where a n/a or nitrous motor make love a muffler for backpresure.

So just because on guy's combo did better with another muffler doesn't mean everybody needs to run out and change mufflers.

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Flowmasters.....how bad?