& that would be because if you look into our tb's, there is no wall blockage from the im to the tb, meaning they already flow/go together perfectly, & i do not see boring the tb doing any good. it is rated as a "4-7hp" gain, but i would think that would only apply to a tb that sees some wall blockage where it meets the im & then of course getting the im bore-matched. ... just a little food for thought, as i know some people do this mod or may be considering it (as i was myself). i may be wrong, but a quick visual would lead me to this conclusion. & even if it did yield 5 hp, the time & cost, if you are getting it done by say maxbore, would be pretty much a waste.
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