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Thinking about how to vent the bad air out of the cowl on the new B model. Don't really want to penetrate the bottom of the cowl like the legacy A model or my Corvair inspired Speed Cowl (™). So looked at how the Jabiru Panther did it, he routed it down and out the bottom at the air exit like an RV8. BTW, I plan on doing the side exits as designed, but putting in an additional small belly exit too.

I currently have two short 1.5 inch diameter extensions about 8 inches long that are spring mounted on my Jabiru manifold that just penetrate the SpeedCowl(™). Thinking of replacing them with a custom bent extender that will bring both sides back together and route the two 1.5 pipes to the middle of the bottom of the firewall.

How? I know of a speed shop who does custom exhausts but will charge more than I want to spend. Midas? I can buy some pipe, a Harbor Freight pipe bender and make my own, or cobble together some preformed pipes from Summit Racing.

I'm crowd sourcing opinions here.

I bet Anthony at meadow lake could build you some extension’s like mine. Very reasonable!


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If you're half decent at tig welding, you can get some preformed bends from burnsstainless.com and fabricate your own. I did that for my bike (and if I had more time I'd like to make a 4-1 collector system for the Aerovee too. :-)

lutorm wrote:If you're half decent at tig welding, you can get some preformed bends from burnsstainless.com and fabricate your own. I did that for my bike (and if I had more time I'd like to make a 4-1 collector system for the Aerovee too. :-)

Not even quarter decent, but I do have MIG welder and can tack weld pieces to be taken to a artisan. Good advice.