I will add that he's fitted TYGAs now, and has seen an increase in power, but I do not know how much, or have any graphs as I'm no longer with Performance Engineering. (The info is second hand, but from a trusted source.)

I am custodian of a set of as-new TYGA MC21 pipes with alloy silencers (only been test fitted, but the owner chose to go with OEM on a restoration instead) in storage in the UK if you, or anyone else might be interested. I don't know how much the guy wants for them, but I will ask.
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Andy.
NSR-WORLD.COM

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