Muffler modification... - 986 Forum - The Community for Porsche Boxster & Cayman Owners

ChrisZang · 09-21-2007, 08:27 AM

yeah, but I'd expect that your car is too loud for normal traffic (Harley drivers will look mad at you

and you will have brutal resonances betw 2,000 and 3,000 RPM

blinkwatt · 09-21-2007, 08:45 AM

The dual muffler styled exhaust already have enough resonance. I wouldn't want to see what straight pipes are like.

blueillusion97 · 09-21-2007, 09:05 AM

When i was modifieing my exhaust with bypass pipes and the mufler was out of a car i started it with just headers on and gave it quite a few revs.......O MY GOD!!!! :dance: It blew my ears off....there is no way you can drive that on a streets and not get a ticked....i would sure love to thou because it sounds just amazing

09-21-2007, 01:57 PM

Same here. I tried a straight through 2 muffler type, too loud for me. I want quiet absolutely no resonance with best possible flow. The "Korda" mod introduces some resonance back in. Don't know the specifics of the mod, but it must've changed the Hemholtz resonator in the OEM unit.

Gary in BR · 09-21-2007, 06:03 PM

Yes I am guilty, i had straight pipes on my 99 Boxster for about a year, there is a video at www.youtube.com/gwhand

was it loud?? Yes...so loud that after a 2 hr drive I would get a headache and talking on the phone was near impossible.

I am glad I tried it but i would not do it again.

j.fro · 09-22-2007, 04:07 AM

I've modified my muffler by cutting holes in the inlet pipes so that some exhaust gases skip a chamber in the muffler. The sound is very nice. There is a bit of resonance right at 2800rpm if the car is under load, but otherwise it isn't bad.

Peer · 09-22-2007, 08:09 AM

Below you'll find a dyno chart for a hacked muffler. I'm just curious what they exactly did to it, since it's quite an improvement, especially the torque.

-- peer