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Re: GheyrodX - bigger, fatter, gheyer!
The OEM manifolds ported work very well, they are a bit restrictive for sure, but spool up is always a good 400-500 rpms better with them and heat is managed better and you get to keep stock heatshields on the Evo X anyway.
Still made 570whp+ on the FPblack with one, it held it back for sure but was adequate.
Both have great benefits.
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