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i think its always worth it. Shouldn't really get too much horse out of it but you'll noticed the increased throttle response and it just will feel better.
well one my old 99 cobra i had a twin 62mm tb you got to port out the inatke holes for the butterflies to open all the wat and not hang up. you ready dont need it unless you got a s/c . there can actully be i loss in tq and hp , my 99 had 291rwhp and 290tq. with just long tubes and 62 t/b under drive pulleys,