well, im gathering the rest of the pieces for my new engine/ kenne bell combo and have asked a bunch of different people about what size header to get. im plannin on runnin a K.B. 2.6 with 20 some odd lbs of boost. im shootin for the 700 h.p. range. ive been told that the 1 3/4 will make more power (which makes obvious sense at that hp level) BUT, that the small gain between the 1 5/8 and 1 3/4 wouldnt be worth dealing with the issues of clearance when installing them. im most likely going to get the BBK's, and will have stage 3 ported heads. just wondering if the 1 3/4 would be worth the trouble vs the 1 5/8.
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