Had an exahust manifold made for my single turbo RX-7 back in 2000... G&S racing out of Florida made it based on their NHRA drag car which had very long runners compared to the kit manifolds available in the day.
Carlos gave me some insight on how he determined length via trial-and-error... something to do with being able to see a change in the metal color and that telling him when the fuel had expended most of it's energy. He'd cut the pipe there and weld up the rest of the exhaust.
When I dynoed my car, I did have a higher peak horsepower with the new manifold, but noticeably slower spool time. This was the old Dynamic Turbo RX-7 from Miami in the late 90's.
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Originally Posted by EBELLO RACING
I prefer two, all depends on how much power. i experimented with lots of header designs. it funny seen long tube headers on turbo. i guess you can charg more money for the looks but doesn't work, believe me. the SHORTER THE BETTER... street,drag,and road racing.
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