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

bigborian · 07-21-2009, 08:07 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?

Lil bastard · 07-21-2009, 08:26 AM

Quote:

Originally Posted by bigborian

Would this be a worthwhile mod hp/tq and 1/4 mile times wise?

You bought the wrong car...

Sputter · 07-21-2009, 08:40 AM

Indeed, you bought the wrong car. However, it's your money to waste.
Don't expect any changes cept sound. You also might end up with less hps.

bigborian · 07-21-2009, 09:15 AM

all that was needed was, "it wouldn't make a difference" thanks "you bought the wrong car" was unneccessary. I bought this car for the wife and she wants it to be "zoomy" I fashioned the Technoflo Air intake for her and she likes it. I was thinking about doing the exhaust to give it a more aggressive sound without being overbearing along with letting the car breathe to free up some horsepower.

I already have a modding machine 2007 honda civic Si that i have done a lot of stuff to already so the boxster is not the "wrong car" for me. I'm not going to mod it out obviously i just wanted to do a few things to optimize the performance of the vehicle in it's stock state. I'm not putting a cat-back on it or putting nitrous on it. It's a daily driver that hardly ever sees the track but letting the car be unique in its own right. It's definately a cruise car but if i could effectively free up the exhaust to allow better flow and better sound i wouldn't mind doing that.

however if there are minimal gains from doing this then i would probably just leave it. Thanks for your input anyways

Sputter · 07-21-2009, 09:35 AM

Yes but you mentioned 1/4 mile times etc. hence the response you got.
A worded differently question would have gotten a different answer.

mptoledo · 07-21-2009, 11:24 AM

actually I was trying to figure out the same thing. There is a thread on here (see link below) that has dyno'd his car before and is going to do it after to see the HP increase. Some people think Porsche purposely restricted the boxster's air flow to cut down on HP to make the 911 look faster. I am eager to see the out come

http://www.987forum.com/forums/showthread.php?t=21061

My philosophy is a few HP here and a few Hp increase there start to add up!! *(as long as its cost effective)

986FortyEight · 07-29-2009, 05:02 PM

BigBorian,

there is an interesting thread by Bill Pickering on muffler tests on the Boxsterspec.com forum. There are some small gains with certain mufflers however it is evident that they are minimal. The greatest improvement to a boxster as far as pick-up and go is to loose the weight. Spec cars drop close to 500lbs... but comfort takes a hit.
That said, there are claims of up to 50hp gains on a boxster S but it involves aftermarket intake, headers, cats/ muffler and ECU remapping...

how bad do you want it?

Mike