at about 1800 rpm there sounds like something metal rattleing against the fire wall, then its gone, did notice it a long time ago but seems to be getting worse, may have something to do with clutch resevour(spell), also at right around 2500 rpm I can hear a very faint popping sound, fast enough it could be all cylinders, or valves, then goes away, could this just be exhaust bounceing off the new hooker headers?, I've got a similar noise on my bike!, the new mods I did were cam, chain/sprocket, pushrods, springs, headers!

btw, does anybody have a 12 bolt they want to give to me?