'06 Z06 bimodal mufflers

[Musclerodz]

Saw an ad the other day for the new Z06 and they made mention of bimodal mufflers whatever that is. Anyway the text said they are vaccum valve operated so they are quite at idle and loud when you stand on it. In the ad pic you could see the butterfly valves on one side of each exit pipe of the muffler.

Not that I am old but it drove me nuts when I had two chamber Flowmasters on my Camaro and had to turn it off in the drivethru's. Anybody know anything about these or know of an aftermarket variant?

Mike

[ilovefirstgens]

haha how about some cutouts and quiet ass mufflers?

Thats what im doing as soon as i find a company that builds a reliable cutout

[race-rodz]

what if you were to take a elec cut out, and hook it to a vacuum relay, the cut out would need some air holes in it, but i would think that at idle you could seriously cut the noise down.

[sinned]

I once knew a guy (dead now) that had a pair on his C4 vette, they worked very well. At idle it sounded stock and anything more than about 50% throttle opened them right up. He was a true best of the best kind of guy, dyno tested and drag strip tested everything, even kept his laptop in the car for evaluations of runs. They were about the only thing on the car that remained for any length of time.

[Damn True]

So is there a vacuum line that runs all the way to the back of the car, or is there a vacuum operated switch in the engine compartment that sends a signal to a solenoid back aft?

[pist0lpete]

If you look to the left of the passenger side muffler it appears there is a vacuum container with a line going off it. The mufflers work all the time no turning them on or off. Although, it didn't take long before people figured out there was a fuse you could remove to make them stay wide open.

[MarkM66]

Originally Posted by ilovefirstgens

haha how about some cutouts and quiet ass mufflers?

Thats what im doing as soon as i find a company that builds a reliable cutout

I think this would be the easiest way to go.

You could also hook the cut out to only open at WOT, with a microswitch.

[TA219]

the only bad thing about a elec cut-out is they are slow to open (by slow i mean ~3 seconds) so they wouldnt be ideal for quick opening and closing

Maybe they have changed, the last one i had was bought a few years ago and i cant even remember who made it

[bobbaganoosh]

Ford Racing has a muffler similar to that that was used in thier fr500 exhaust system for the Mustang Cobra. You can buy the mufflers seperately, but they are kinda pricey at $300 for the pair (cheapest I've found so far). The fr500 mufflers are backpressure operated instead of vacuum. They are for 2.5" pipe and both inlet and outlet are offset to the same side.

[customcam]

Some people with c6 z06 have customised a switch were they can open & shut
rather than taking out the fuse!