Cherry Bomb - Vortex!

[Kenny]

The fiberglass packing in the muffler, or resonator, does not add resistance per se or affect backpressure. All it does is dampen the reflecting sound to help reduce the resonance and blend the exhaust note. Extra baffling in the muffler and smaller pipes will create back pressure.

Theoretically we should get some minor improvement in performance with higher flowing exhaust through the scavenging effect it is supposed to make. Meaning it will help "suck" the exhaust out of the piston chamber as opposed to letting it be pushed out. I guess this is supposed to reduce the effort the piston makes on its second rise to exhaust the cylinder - in essence improving efficiency.

Were the duals and high flow cats and open mufflers will shine is if you improve intake air velocity/amount. i.e. better intake, and ultimately, a supercharger.

I'd say the more insulation the better as opposed to constraining flow with baffles (my old Morgan tec had no insulation and basic baffling so it liked to develop a nasty resonance at a specific rpm due to harmonics - insulation dampens this effect). I think Magnaflow mufflers are on the loud side due to their goal to maintain high flows with minimal baffling. From my experience, they should be complimented with a resonator or glass pack to tone em down a bit.

Personally, I'd lean more to a heavier muffler just to get the sound levels down. If you don't plan on supercharging, and want a growl, I think one of the heavier models by Flowmaster, Cherry Bomb, Aeroexhaust, should work.

I's say our biggest challenges are being 6-cyl (we all really want that 8-cyl purr) as well as a very short underbody with little room to play with pipes and such.

[Ascinder]

Backpressure is fairly straitforward. More usually increases torue, but decrases horsepower and vice versa. There is obviously a sweetspot where you get the best of both and sound is always a concern. This is why you hear people on here adding dffusers and restricters, too much free flow equals no low end get up and go, while too much back pressure makes you engine have to try and "pump" out your exhaust more than normal. Try removing you muffler and driving around the block. You will feel a tangible loss in the acceleration/pickup department.

[VCross007]

Yea, I'm all stock, I did the elbow removal plus k&n filter. I noticed good mileage and hp gain, and also when i replaced the pcv valve. When i put the super 40 on i noticed a decrease in low end torque. Also , it seems to shift between gears around 50mph. If i let up on the gas, the rpms go up above 2k, but if i put my foot back down, they'll go up to about 2300 or so then shift down into 4th. it's really annoying and i dont know what to do. I get about 300 miles to the tank, im currently at 283 and have a quarter tank left, but ill fill up tomorrow to be safe. I want to go to borla, but i want to make sure that muffler that ldub has has better backpressure. I guess if you have too little bp, it has a negative effect and flows too much. who knew

[VCross007]

oh and to silverbullet, it's cool man. with cars it's all trial and error. you just keep tryin till you find the muffler u want. I just want something loud and mean

[taylorRichie]

That's why I've always like supertrapp exhuasts. You buy a muffler, then tune the backpressure, and sound to the "sweat spot" for you.

[SilverBullet75]

That's why I've always like supertrapp exhuasts. You buy a muffler, then tune the backpressure, and sound to the "sweat spot" for you.

I almost went with SuperTrapp... but the last time I did, the sound was too "Brapppp"y...

[taylorRichie]

I almost went with SuperTrapp... but the last time I did, the sound was too "Brapppp"y...

I did Dual 4.5" ones on my 4.3 Liter V6... It did sound a bit Brappy, but more THroaty.

It sounded great about 3rd gear Wide Open Throttle.

Exhaust is definitely a tough one.

[Ldub]

I just want something loud and mean

If you lived closer, I could introduce you to a couple of my X's.........