What I have experience with are Hookers. At track you will not gain or loose MPH with comp vs super comp. I doubt you will see any seat of the pants feel 1 7/8" vs 2" as its worth about 5 lbs under 4000 rpm on dyno. I have used both sizes of comps and 1 7/8 did have better spark plug access. I also order them plain, fit them, then ship out for coating.
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