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Originally Posted by Johnny Danger
I've seen the Fabspeed headers. They are a nice product indeed. However, the M&M headers use nickel throughout their design, to include the very best HJS cats that incorporate a true tri-metal configuration.
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The difference between these two manufacturers is that Fabspeed constructs theirs from T304 SS and the M&M headers are constructed of T316 SS.
Ni is approx. 8-10.5% in T304.
Ni is 12% in T316. T316 is made for marine environments.
Unless you are exposing your undercarriage to salt, say in a South Florida environment, or Northeast winters, that would be the only benefit of owning the M&M headers.
Hp gains are the same +/-.