2 in 2 out sports exhaust

911hillclimber · Post by **911hillclimber** » Sun Apr 03, 2011 12:44 pm

My Leistritz (spelling) when near new ran 105 dB with the three outlets open. (measured to MSA hillclimb spec)
It got a lot noisier over time and is well over now. Sounds a bit dull with the middle two closed.

Alan was developing one wasn't he?

PhilipB · Post by **PhilipB** » Sun Apr 03, 2011 2:08 pm

amallagh wrote: I'm not aware of any std 911 exhaust that passes the MSA static noise test. If there is one then I'd buy it ?
Andrew

Neil Bainbridge has one in production. The prototype has been tested on a race engine and came out at 104 dB @ 5000rpm. See Mike's RSR restoration thread for details.

hot66 · Post by **hot66** » Sun Apr 03, 2011 3:35 pm

911hillclimber wrote:My Leistritz (spelling) when near new ran 105 dB with the three outlets open. (measured to MSA hillclimb spec)
It got a lot noisier over time and is well over now. Sounds a bit dull with the middle two closed.

Alan was developing one wasn't he?

my 'stock' single outlet stainless back box with standard exchangers measured 105Db @ goodwood based on 3/4 of 7200rpm

911hillclimber · Post by **911hillclimber** » Sun Apr 03, 2011 6:11 pm

The hillclimb 'method' is 3/4 Red line measured at 1000mm away from the outlet @ 45 deg to the outlet.
Still a bit too close for comfort.

amallagh · Post by **amallagh** » Sun Apr 03, 2011 7:07 pm

Demonstrates the difficulty in comparing results
Rallying is 2/3max rpm at 0.5m and 45 degrees to outlet.

squirdan · Post by **squirdan** » Mon Apr 04, 2011 7:52 pm

neil bainbridge is doing a 2 in 2 out exhaust that comes ceramic coated and passes a 105 dB noise test

see previous thread by Mike...think its called RSR exhaust or exhaust test

Lightweight_911 · Post by **Lightweight_911** » Mon Apr 04, 2011 10:16 pm

squirdan wrote:neil bainbridge is doing a 2 in 2 out exhaust that comes ceramic coated and passes a 105 dB noise test

see previous thread by Mike...think its called RSR exhaust or exhaust test

- see Philip's post earlier in this thread ...

domtoni · Post by **domtoni** » Wed Apr 06, 2011 12:54 pm

B and K out of Wisconsin do one as well in SS.

hamishf · Post by **hamishf** » Wed Apr 06, 2011 2:35 pm

Unitl now I've always had Dansk (not stainless) again for the noise. Given I wanted to do track days, I got turbo thomas to do a stainless one, (two out, one side capped). It delivered additional horsepower (uncapped) than the dansk, though doesnt sound as good (on overrun). Looks nice in stainless, and lasts well too.

911hillclimber · Post by **911hillclimber** » Wed Apr 06, 2011 6:32 pm

My old Liestrick 2 in/3 out/centre 2 capped makes a great tone (esp all open).
Wish they still made them.
Transend used to sell them I think?