[SquirrelNutz]

If you dont believe that stick it on a dyno dynos dont lie.... I want to see proof that no backpressure is great on any kind of vehicle carb'd or FI

[Justincredible]

Last winter, I had the privilege to watch Sammy Vincent (NMRA SSO Racer) do extensive dyno testing with back pressure and different muffler types....

On the chassis dyno...his car picked up a sizable amount of hp and tq simply by adding a set of mufflers and short extensions to his open headers...

I cant give any numbers (swore on my life not to) but the gain really-really surprised me.

[ChrisJ]

In the words of the MYTHBUSTERS

Myth CONFIRMED!

[Screemin3o2]

I can't believe this thread is still alive lol.

[ChrisJ]

People are still trying to debate it...

[99mustang232]

unless you are running a turbo the proper ratio of tuned backpressure is wanted. this will promote ideal exhaust scavaging producing peak performance. anyone who has ever had an exhaust gasket or manifold leak should know there is a loss in power. the power loss is much more noticeable in lower hp motor like the 4banger and v6's where 10hp or so feels like more of a difference. hell go down to you local bestbuy and scout out the ricers, you know the highschool kids with the hondas and type R fart cannons, wouldn't be suprised if half of them are actually slower than stock

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Originally Posted by SquirrelNutz What pipe size should I use for a street application? In general, the following guidelines should be applied for street applications. 2" tubing up to 100 hp per pipe 2.25" tubing up to 160 hp per pipe 2.5" tubing up to 200 hp per pipe 3" tubing up to 300 hp per pipe THIS IS FROM THE FLOWMASTER SITE.... I dont know where some of yall are getting your information but you do need backpressure there is no myth there! Too much backpressure is bad and too little backpressure is bad and that is fact!

look at this chart:

[Bill]

Originally Posted by 99mustang232 unless you are running a turbo the proper ratio of tuned backpressure is wanted. this will promote ideal exhaust scavaging producing peak performance. anyone who has ever had an exhaust gasket or manifold leak should know there is a loss in power. the power loss is much more noticeable in lower hp motor like the 4banger and v6's where 10hp or so feels like more of a difference. hell go down to you local bestbuy and scout out the ricers, you know the highschool kids with the hondas and type R fart cannons, wouldn't be suprised if half of them are actually slower than stock ----------------------------------------------------------------- Originally Posted by SquirrelNutz What pipe size should I use for a street application? In general, the following guidelines should be applied for street applications. 2" tubing up to 100 hp per pipe 2.25" tubing up to 160 hp per pipe 2.5" tubing up to 200 hp per pipe 3" tubing up to 300 hp per pipe THIS IS FROM THE FLOWMASTER SITE.... I dont know where some of yall are getting your information but you do need backpressure there is no myth there! Too much backpressure is bad and too little backpressure is bad and that is fact! look at this chart:

true that. Talked to some people with those huge fart can mufflers and because of that they burned there Valves. Lack of Backpressure.

they think because they put on that Huge mofo of a muffler its actually helping them when its really hurting there performance and there Engines. probally 9/10 of them are only putting them on so they can sound like a weedwacker on steroids.

[232stang]

correct me if im wrong but glasspacks are essientialy the same as fart cans right? just not where your head can fit. lol

[ChrisJ]

Glass packs a blow through muffler yes...But they are not fart cans...

Glasspacks are one of the oldest muffler designs...

SLP and a few others use them...

Me personally I am a chamber muffler person...

[232stang]

Originally Posted by ChrisJ Glass packs a blow through muffler yes...But they are not fart cans... Glasspacks are one of the oldest muffler designs... SLP and a few others use them... Me personally I am a chamber muffler person...

well i didnt mean they were fart cans by no means but with the absence of backpressure with fart cans is that because they are extremely large? and if so is that why glasspacks are safe to use as opposed to fart cans? not thats someone who would use glasspacks would even think of going fart cans. btw what would be the correct terminology for fart cans? besides that lol.

[ChrisJ]

A glasspack is a muffler that exhaust gas passes straight through the center of the muffler. Packed fiberglass surrounds the exhaust channel and absorbs some of the high-frequency sound. All mufflers impede the flow of exhaust gas and create back pressure on the engine.

Glasspacks are an old, simple, and relatively inexpensive design. They are very effective at reducing back pressure, but not very effective at muffling noise. Thus, they not only make the engine more powerful, they make it sound more powerful.

A glass pack gets louder over-time as the fiberglass material inside the muffler wears out or gets blown out...

I dont know much about the fart cans though other then they use stainless steal mesh to get there sound...

I just call them fart-cans...I think that is their official name...