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just like the subject.. whats the difference? as far as i can research the cams are different.. so the straight neck has KL-31 cams, and the curve neck has the same cams as my stock 1.8? or somthing different? i went with the curve neck because it was a straight swap into my 94 GS. is there a noticeable difference between the power of the two engines?

also, i have a complete header and downpipe kit installed.. planning on going with a highflow cat and some sort of muffler(havent decided yet) what size pipe should i use? factory or go with somthing like a 2.5 inch?

thanks in advance.