As you can see the topspeed is 2 smaller pipes, not one large one like OEM. I would guess that the total flow is a bit higher, and a lot smoother an OEM. I stand by my comments earlier that this header gives a definite improvement in the low-midrange. But not a lot top end. But for the money, about $320 is a friggin bargain.
The design is 4-2-1. Its very well put together for such a cheap header. Stainless steel and welded together good. Flex pipe is crap but mine hasnt failed. I forgot to tighten my header and 12 months since I installed it was a bit loud and i got a dyno done which i thought was a smidge low. So I took it to honda and yep! Leaking like a mofo! Check your header after 3 weeks not 52 weeks! More mods then i redyno...
Mine hisses a tiny bit. A LOT LESS after I tightened my loose header!
Im changing my flex pipe soon. Its not failing, i just want a proper quality one.
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