559type_r wrote:mmmm... well yeah, ain't header there just for a better air flow?.. not only that all header 4-1 header are design the same! so don't it perduce the same power... so wat really make a different between a $500 header & a $150 header.. when it both look the same?
Try looking closer...
While to the average joe, they "look" the same by having 9 bolt holes, 4 primaries and a collector (leaving out the 4-1 vs 4-2-1 design differences) sure they appear to be similar...
HOWEVER when you take a closer look some have anti-reversion chambers (SMSP, Hytech) and larger diameter primaries. The merge collectors and how the INSIDE of the merges are makes a WORLD of difference. I've seen some that are just welded together, and then I've seen some that are works of art. I've never had a new hytech in my hands, but 2 SMSP's and I would imagine the build qualities are very similar. The welds are PERFECT, at the merges they are smooth on the inside.
I'd be willing to bed you'd pick up more WHP (assuming all stock) by replacing the header than the intake or exhaust system. As for the price difference of say a Megan (not Mugen) and the hand built ones... well they are hand built (and sometimes to custom dimensions as with my PY) they are TIG welded, they have better ground clearence. Usually made out of better materials (Stainless steel, instead of coated mild steel)
The list goes on and on... but a $150 header and a 1k + header are NOT the same. If that were the case, why would people spend the extra money on them?