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When i did mine , after fitting the x pipe, I then traced the outline onto the muffler pipes and opened the holes to within an 1/8" from the marked line. I dont have a final pic but I enlarged the holes substantially larger than in the picture. The hole on the left pipe is closer to being done than the right side...... custom enlarging these holes is what takes most of the time.....a muffler shop might just blow a hole with a torch and may not remove the slag from around the hole interfering with exhaust flow
On my 997.2 I purchased the FVD-Brombacher sport exhaust because my Gundo hack mufflers sounded like crap. I removed the Sharkworks bypass because I thought it was just too loud. I like those much better than the Gundo Hack mufflers. It is really hard to base an opinion on sound until you have heard them in person. Even the FVD Brombachers didn't sound as I heard on the video to me. This is why I removed the bypass to reduce the sounds.
Did you find out what went wrong? I am going to do this gundo hack and hope to do it right. What is the clue here?
Originally Posted by fredrikr
Hi Guys,
I know this is an old tread. But im trying anyway.
Did you figure out about the problem? I just had mine 997 C2S done and im in the same boat. The car sould terrible i have to say. its ok on idle and from 5k and up but in the middle section it sounds like a Volvo 240.
I have an idea that the muffler guy made smaller holes than the actuall 2"inch tube beeing used. Could this cause ?
I would say the exhaust note is louder, but at the same time it sounds more boxed in (bad flow?)
Last edited by norwegiancarguru; Sep 22, 2020 at 07:40 AM.
I have a simple paper PDF template a 2” pipe gundo hack if you are going to do it your self. Then you can mark the inlet and outlet pipes to get the correct cutout size.
I have a simple paper PDF template a 2” pipe gundo hack if you are going to do it your self. Then you can mark the inlet and outlet pipes to get the correct cutout size.
