OEM Muffler Flow Rates? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

edevlin · 01-07-2007, 03:35 AM

Does anyone know if the flow rates are the same for an OEM Non-S and a S muffler. I was searching on the site and could not find any information. I would think that the 3.2 motor would require a higher flow rate than the 2.7.

The reason I am asking is that I would like to have a higher flow rate on my 2.7L exhaust system which is running headers and high-flow cats, but with my stock muffler.

I have tried two aftermarket mufflers so far, the Dansk had a resonance I did not like and the Gemballa was LOUD.

I have had my Boxster in the shop for a week, I will be picking it up tomorrow. It is having Bilstein PSS9 suspension installed, I cannt wait....

Ed

j.fro · 01-07-2007, 06:41 PM

The internals on both mufflers are identical. I would assme that the flow rates are the same. On another board folks have posted pics of the mufflers cut open.

MNBoxster · 01-07-2007, 08:33 PM

Hi,

You're assuming that the Base muffler is max'd out, which I doubt, and if it is, probably only at WOT, again which I doubt.

There's likely no real benefit to a switch, except the aesthetics of the Tail Pipes. Aftermarket pieces may be improved, but the OEMs are probably same-same...

Happy Motoring!... Jim'99

TriGem2k · 01-07-2007, 10:34 PM

Hey Ed what did you end up doing with the Gemballa exhaust that was too loud for you? If you still have it I might have a buddy interested in purchasing it from you.

BTW you are going to LOVE the PSS9 setup. We had 80degree weather today I racked on about 200 miles in the twistiiiis. Just can't seem to get enough of it.

James

edevlin · 01-08-2007, 03:23 AM

Thanks all for the feedback on flow rates and internals on the stock 2.7L OEM muffler. I not really interested in the look of the muffler, just wanted to be sure that the intake/exhaust system was breathing optimally, as I am trying to squeek out all the performance I can.

I had wondered about the stock muffler flow rate because some have reported a modest increase in HP by only replacing the stock muffler. BTW, the exhaust sounds very nice currently with intake, headers and 100-cell cats into the stock muffler, so I am not looking for louder sound.

I have had all the exhaust work done by the folks at Auththority Pitstop in DC. They are the ones that stuck on the Gemballa muffler for me to try. It is still sitting on the floor of their showroom. It is in as new shape, but is a used muffler, they may even have around on consignment, I am not sure. If anyone is interested in it, just drop them a line.

Ed

RandallNeighbour · 01-08-2007, 10:30 AM

Ed, what kind of 100 cell cats did you put in, and how much were they?

The Dansk version I found for my 2.5 were something like $1300... ouch!