Racing exhausts

[rastta]

Mine is a purpose built racing exhaust consisting of tubular headers - I think they are FVD going into custom made three inch pipes - each with a Borla race muffler and existing out where the license plate used to be. I added heat shielding to the pipes where they go by the inner CV's. I will try and post better pics (close ups) that I currently don't have access to.

[j.fro]

I just got this finished:




The mufflers are Full Boar single chamber; the tubing is 2.5" mandrel bent stainless from the cats to the mufflers, and from the mufflers out.

The older cats and headers are are 100 cell Mandrel Bend Solutions cats welded into Fabspeed bypass pipes. The headers are the cheapo Chinese ones.

For the mufflers and pipes, I paid $165 from Performance Curve in Roanoke VA. A local muffler shop welded it up for $150.
This setup replaced a Borla Boxster S muffler. After just a couple of days of listening, this setup seems quieter but deeper at idle, quieter with less resonance at highway cruising speeds, but louder/deeper at WOT. Hopefully I can get some dyno numbers with the new system.

[911monty]

Nice work J.fro! Just curious why you painted the exhaust in flat black. I understand it is best at transferring heat, but this will transmit a lot of heat into an already hot engine compartment?

[j.fro]

Funny you should mention that. I've cleaned the tips back to stainless.
The main reason for the black is that the whole car is silver and black. I know what you mean about black, so I'm hoping this isn't making too much difference.

[911monty]

Originally Posted by j.fro

Funny you should mention that. I've cleaned the tips back to stainless.
The main reason for the black is that the whole car is silver and black. I know what you mean about black, so I'm hoping this isn't making too much difference.

Yeah I would like to murder out my triple black box. So besides the heat into that already challenged engine compartment, black also transfers heat out of the exhaust. This slows exhaust velocity and reduces scavenging. A good reason to run ceramic coating. Since you're running 2.5" pipe your velocity may already be a little low. Just thinkin' outloud.