I can't point to the actual source, but the story is that one of the big rotary after-market performance suppliers tried a lot of different headers on the RX-8 (Renesis) & couldn't get more than around 7hp more than the stock manifold. Supposedly due to the no-overlap nature of the Renesis intake/exhaust tuning.

Charlie

On 08/22/2011 05:00 PM, Dwayne Parkinson wrote:

Don't know the optimal length but turns and bends do affect the output.

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From: Samuel Treffinger <samuel.treffinger@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Sunday, August 21, 2011 5:43 PM
Subject: [FlyRotary] Renesis Exhaust

Hey, How long is optimal for the Exhaust runners in the Renesis engine before joining at the muffler? also, Do turns or bends in the exhust system affect the output?

 

Sam