986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post

blackbox · 09-15-2009, 05:46 PM

I, like so many others here built my own exhaust system. I basically copied a stebro race setup, but i used aluminized 2" steel.

The sound is identical (to my ears) to all the stebro clips that I've heard. The sound is awesome. Of course I got the "drone", but I also got a faster throttle response (which I love). I haven't had a chance to dyno it yet because the only local shop with a dyno has computer software/hardware problems. Hopefully they will be up and running soon.

My understanding of the drone problem is pipe length (engine vibration causing the pipes to resonate at a particular frequency based on pipe length) and lack of acoustic baffling to combat the first problem.

Would a tip insert style baffle (like the harley guys use) do anything to help with the problem, or would it only lower the decibel level? It might just move the drone to a different rpm range.

I'm just thinking out loud I guess. I've only got $200 bucks in this project, but I would really like to keep it installed. any ideas?

09-15-2009, 05:46 PM	#16
blackbox Registered User Join Date: Apr 2007 Location: Marshall, TX Posts: 62	exhaust baffle for race exhaust I, like so many others here built my own exhaust system. I basically copied a stebro race setup, but i used aluminized 2" steel. The sound is identical (to my ears) to all the stebro clips that I've heard. The sound is awesome. Of course I got the "drone", but I also got a faster throttle response (which I love). I haven't had a chance to dyno it yet because the only local shop with a dyno has computer software/hardware problems. Hopefully they will be up and running soon. My understanding of the drone problem is pipe length (engine vibration causing the pipes to resonate at a particular frequency based on pipe length) and lack of acoustic baffling to combat the first problem. Would a tip insert style baffle (like the harley guys use) do anything to help with the problem, or would it only lower the decibel level? It might just move the drone to a different rpm range. I'm just thinking out loud I guess. I've only got $200 bucks in this project, but I would really like to keep it installed. any ideas?