Exhaust Header Question

[tdsongster]

I am looking into a full exhaust for my 400. I was thinking of getting an hmf system but wondering if there is any advantage to getting a powerbomb header instead of the hmf header?

[400grl]

I had a hi-flow header on my 440 - it was great....you might want to check out one of those, too..... :)

[youngdawg]

Hi, I Have a 440 with a White Bros. R4 and thinking of getting a powerbomb. Good or Bad and what gains. Also,what muffler did you have? Any info is appreciated 400GRL and thank you...happy riding...