986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - How restrictive is the stock boxster muffler?

bigborian · 07-21-2009, 09:07 AM

from the looks of it it has to go through 3 chambers before it exits through the tail pipe that seems like a lot of looping around for no reason. I guess they do this to not only restrict exhaust flow but to muffle the sound a little. Gains from just bypassing the muffler or straight piping it looks like it would free up some horsepower.

The stock headers (or exhaust manifolds) all the way to the tail pipe is a realtively small distance, this makes me think that porsche did this on purpose to muffle the exhaust and the flow otherwise it would be too loud or too efficient in exhaust flow.

I've thought about doing the Pedro sport exhaust a little differently, there's a guy that will do the exhaust work for me for a decent price. I was thinking maybe putting something into the stock muffler inlet to lessen the flow into the 3 chamber system and allowing it to go straight through to the tail pipe through the bypass pipes.

I'll post pics later i'm at work and can't do it right now but it might clear up some confusion.

Would this be too loud for the street? Would this be a worthwhile mod hp/tq and 1/4 mile times wise?

07-21-2009, 09:07 AM	#1
bigborian Registered User Join Date: Jul 2009 Location: California Posts: 56	How restrictive is the stock boxster muffler? from the looks of it it has to go through 3 chambers before it exits through the tail pipe that seems like a lot of looping around for no reason. I guess they do this to not only restrict exhaust flow but to muffle the sound a little. Gains from just bypassing the muffler or straight piping it looks like it would free up some horsepower. The stock headers (or exhaust manifolds) all the way to the tail pipe is a realtively small distance, this makes me think that porsche did this on purpose to muffle the exhaust and the flow otherwise it would be too loud or too efficient in exhaust flow. I've thought about doing the Pedro sport exhaust a little differently, there's a guy that will do the exhaust work for me for a decent price. I was thinking maybe putting something into the stock muffler inlet to lessen the flow into the 3 chamber system and allowing it to go straight through to the tail pipe through the bypass pipes. I'll post pics later i'm at work and can't do it right now but it might clear up some confusion. Would this be too loud for the street? Would this be a worthwhile mod hp/tq and 1/4 mile times wise?