Quieting your exhaust- some good info

[igo4bmx]

Dynomax has a new muffler with a throttle plate setup in the muffler.
looks like it does a great job of keeping the exhaust quiet at idle and low rpms while not effecting performance!
http://forums.evolutionm.net/evo-engine-turbo-drivetrain/493903-project-valve-technology-muffler.html

[turboman808]

Not a bad idea really.

I tried to quiet down my porsche but with the air cooled fan and ITBs even with a quiet muffler it's still freakin loud as hell.

[jpalamar]

Or don't drive a preforance car with an aftermarket exhaust. Problem sovled.

[enigma]

Sparky, when you drive your "performance" car over 70 miles a day, for 5 years, the constant hymm of the exhaust gets old. Or maybe I'm just getting old.

[jpalamar]

Your just getting old :-) I've had mine on the GTO for 2 years now, its my DD and I drove an hour each way and it really doesn't bug me at all. To be honest, I dont' even notice it anymore.

[turboman808]

I was able to get a quiet performance exhaust for my gxp. Of course it goes thru a turbo, performance cat, resonator, then the muffler. Has a real nice rumbling sound.

http://www.solo-performance.com/exhaustk.php

[DPancoast]

so its the equivalent of an electronic cut off?

cool that a company is installing it so that it lasts long and is properly done (assuming), but it's old technology

[Got Insulin?]

Sparky, when you drive your "performance" car over 70 miles a day, for 5 years, the constant hymm of the exhaust gets old. Or maybe I'm just getting old.

Bingo. The drone of the 2.5" Burshur on my 1G just grates on me at 70. I wound up putting my interior back in just to dull it down some.

(EDIT): Now that I think about it, don't the VW R32s come with these valves stock? Very cool idea NTL.