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I have a 99 2500 v10 203k miles, with some peculiar issues.

Mods: no cats, kn cold air, dual exhaust W/ flow master 44's, exhaust is stock until the mufflers than goes to 3 in. Shorty headers on the way.

Noise issue: I have been noticing on the highway when accelerating above 2k rpm I hear a clicking sound that sounds like my valves, but my valves will not make any noise while the truck is parked, it also wont make the noise if I manually actuate the throttle to 2k ish rpm. It only makes it while under load. Any ideas?

Power issue: After removing my cats I have noticed a significant drop in power, this truck has hardly any get up and go now, I have replaced the O2 sensors and the Throttle position sensor to no avail.
 

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The O2 sensors are trying to read exhaust after the CAT has "cleaned" it so to speak. So if the exhaust it is sensing is rich it may be cutting back on how much fuel it allows and ignition timing.
 
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