Custom Exhaust

All I said was I saw where a person on a website with an aftermarket exhaust wrapped header tape (or some other varient) around the 2 mufflers. He said it helped. I would believe it due to the absorbing properties of the tape changing the resonant frequency of the metal. Do I know for a fact, no. But try it... you got nothing to loose but a couple bucks.

[Bisimoto]

Where,
Since you live in the same city as I do, and may not mind visiting my facility in Chino, feel free to stop on by, so that I can take a look at your system. I may have a solution for you.

I just made a custom prototype unit that does not have the problems you have encountered...nonetheless, I am curious to your DB level with the current setup. Let me know!

[Rodger]

Someone needs to design a long-tube Boxster exhaust that uses small muffler cans. Instead of entering the U-pipes and going straight into the muffler, the exhaust needs to be routed to the opposite side of the muffler. Example, the left bank's exhaust would enter the right side of the muffler and vice versa. This would effectively add length to the pipes and reduce or completely eliminate the droning. The two cross pipes could be routed directly behind the tips and the muffler cans could be about the size of a GHL exhaust's.

^^ Does that even make sense? It's late.

[John V]

Originally Posted by Schnell!

Someone needs to design a long-tube Boxster exhaust that uses small muffler cans. Instead of entering the U-pipes and going straight into the muffler, the exhaust needs to be routed to the opposite side of the muffler. Example, the left bank's exhaust would enter the right side of the muffler and vice versa. This would effectively add length to the pipes and reduce or completely eliminate the droning. The two cross pipes could be routed directly behind the tips and the muffler cans could be about the size of a GHL exhaust's.

^^ Does that even make sense? It's late.

Yes, it does make sense, and I suspect it would help. We had plans to do this, but never got around to finding the time.

By our calculations we needed something like 6' of exhaust length (per side!) to kill the drone.

[Bisimoto]

Based on my experience with exhaust engineering and designs, the extra piping length post header/manifold will help slightly for "drone-prone" systems. More influence can come from the proper tuned length of the header manifold exiting the exhaust ports of the engine.
I may have found a system design that works well with the factory exhaust header manifold, but I am not done testing my prpototype to fully confirm this result. I will keep everyone posted.

[John V]

Originally Posted by Bisimoto

Based on my experience with exhaust engineering and designs, the extra piping length post header/manifold will help slightly for "drone-prone" systems. More influence can come from the proper tuned length of the header manifold exiting the exhaust ports of the engine.
I may have found a system design that works well with the factory exhaust header manifold, but I am not done testing my prpototype to fully confirm this result. I will keep everyone posted.

I am interested - assuming you can make something drone-free that does not alter the piping until after the last catalyst. Because of the restrictive rules that I compete under, we are not allowed to touch any exhaust parts before the last cat.