Gundo hack using 1" pipe versus 2" pipe
#1
Gundo hack using 1" pipe versus 2" pipe
I have the mufflers off the car and am getting ready to do the "Gundo hack" bypass connecting 2" stainless pipe between inlet/outlet pipes on the stock 997.1 S mufflers. I read that this mod was originally done using 1" stainless versus 2" stainless. The car is LOUD without the mufflers and this got me to thinking that I might be happier using the 1" pipe v.s. 2" pipe. I am intersted primarily in TONE and not in LOUDNESS. Anyone done this mod using the 1" stainless pipe or heard a car with the 1" pipe ? I read that this mod was originated by Darin Fister ( fisterd on Rennlist) and he used the 1" pipe bypass. I have heard several sound clips using the 2" pipe bypass and they do sound a bit loud, at least to my ear.
Thanks for your responses.................
Thanks for your responses.................
#4
Thanks for the responses. The welding shop will install the 1.5" stainless pipe bypass on Monday. I feel this will give me the sound that I am looking for and closest to the PSE open exhaust sound.
#6
Race Car
I'm planning on doing the 2" next weekend...
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#8
Not in MA anymore
Rennlist Member
Rennlist Member
#11
Racer
Here you go. I've done both - the 1" will have a higher pitch, the 2" will be deeper and louder.
This is what is possible if you add AWE cats to the equation:
View My Video
Here are some pics of the finished hack:
This is what is possible if you add AWE cats to the equation:
View My Video
Here are some pics of the finished hack:
Last edited by Gundo; 04-10-2010 at 08:11 PM. Reason: found a video
#15
Zeus 993: Yes, i am VERY happy with the 1-5" Gundo hack. No noise violations and NO resonance at cruising speeds. Really comes in throaty upon heavy acceleration and sounds VERY Porschelike versus many of the other aftermarket mufflers............ :-) Have had many complements on the sound by many fellow Porsche Club members and people on the street.