Quote:
Originally Posted by scraejtp
Seems like a poor design if you aren't looking to move towards a turbo kit then.
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I am not going to say anyone copied anyone else but Nameless came out with a 4-2-1 design early on which uses an even bigger loop, so much it requires using a different radiator fan. With an equal length design there is only so many ways you can route the larger diameter pipes and be EL. The angle you need to use to fit the merge collectors and still have smooth bends is limited, this necessitating the loops in the P&L, FA20, and Nameless headers.
The other option is make the primary pipes coming off the engine loop around which some of the other manufacturers have done like Borla but the piping diameter is smaller. The other thing the loop allows in the P&L and FA20 headers is room for a cat.