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Akilldema
I own my own service and performance shop specializing in the Big 4 sportbikes. We also have our own Dyno (250i with fuel / air monitor and load control) and we naturally have installed truckloads of header systems, jet kits, and Power Commanders. All this stuff helps, but they 'never' even come close to the advertised claims and promises so easily passed along by vendors. I often hear of 10, 15, and even 20 HP gains. What a laugh, except it's not quite so funny for the customer when he reads his own Dyno report showing very little gain. Even in more 'believable' instances, gains of 5 or 10 hp are actually the result of 'all' the improvements made at the same time. Getting the valve clearances correct, new plugs, cleaning the air filter, etc, may well have accounted for most of the increase, but the header, jet kit, timing advancer, etc, always get the credit.
Don't get me wrong, headers are great. Whenever I bring a new bike home to my garage, there's a brand new header already waiting. It's all about a better sound and look, so don't get all hung up attempting to find out which one works best. It's actually more important to get one that actually fits without slamming into the oil filter, frame, oil pan, side or centerstand. There's also a huge difference in the build quality of the various systems. Generally speaking, the dedicated header folks do a better job than brands like Muzzy or Yoshimura that are involved in many other things (distractions). So compare them physically and listen to them for yourself. Of course, the best headers are, naturally, the most expensive.
 

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karl_1052 said:
what do you base that claim on?

exhaust systems for bikes with exhaust valves actually hurt low end performance for a gain on top.
Um, actually that statement is bullshit. You should say "most" instead. I had a CBR929RR, I dropped the stock exhaust, and got rid of the exhaust valve, HTEV I believe it was called. I mounted a Full Hindle system with a Ti end can. I gained power everywhere through the range. At no point was the stock system more powerful than the Hindle. Yes, I had it mapped.
 
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