I'm building up a MC21 trackbike, and I want some chambers that are torquey and easy to ride fast with.

I had a MC18 with HRC RS250 pipes, circa 1991. Uber top end , nothing under it . Don't want to go there again...

I'm looking for something nice and torquey, even if it doesn't rev out much beyond the stockers
Any advise gentlepeoples? JHA SP? TYGA? Harc pro? Ethos? Dog fight?

Cheers folks
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The Chopster