Performance exhaust below 100dB?
 

I'm in the marked looking to buy a set of performance headers with heat exchangers. This is going to be put on a rebuilt 3.4 (from 3.2) with EFI and ITB's. So I've sold the old SSI exhaust, and opting for some 1 5/8 or 1 3/4 inch outer diameter primaries.

The noise limit on track days in Norway is at 100dB at 3 feet from the exhaust tip, when revving to 4000 rpm.

So:
What brand / combination (Except SSI or dansk) will keep below the noise limit of 100 dB?

Anybody got some experience on this?

I've looked at the Hayward & Scott set, but thought I'd ask here first.

Thanks...

i haven't measured it but the Bursch 1 in 1 out exhaust I have is not much louder than stock.

Well, I need the entire system, with two-in muffler. So that's not an option.

Hayward & scott assures me that their system will clear the noise limit, so I guess they'll do just fine.

On our 3.4 twin plug w/50 PMO's I used 1 5/8" European Headers by George and a Flowmaster 80. At Infineon Raceway (Sears Point) I was 92db.

I don't think Infineon is measuring the sound at 3 feet. That is an ontrack measurement.

On an exhaust thread a couple months ago Steve Wong mentioned that someone had made an extremely quiet Bursch style exhaust using a single turbo muffler. He reported that on the Dyno it produced only 4 HP less then a wide open exhaust. That equaled the other best performing muffler which was way more expensive and WAY louder. I have a Dynomax 17749 that just arrived which I will be fabbing up a system for my B&B headers.
(Hoping for stealth mode!)