Engine Ticking After Underdrive Pulley and Header Install

Got a 99 v6 with little over 100k ..Recently after getting a tune-up and compression check..All cylinders good. I decided to put on a underdrive pulley , and set of BBk headers. Had a franchise shop put em on. BIG MISTAKE. After getting the car back I noticed a loud tick. Not the exhaust. I returned it to them. The tick isnt gone but quieter . They refuse to take responsibility . Anyways..Its gotta be ike a valve , rod , bearing , lifter..or i dunno ..But I also seem to hear a metal ticking in the sump area under too. Could the Underdrive pulley have messed with the Timming during install?...Could the underdrive pulley affected the oil pump?...Could the underdrive pulley affected the spark output?...I upgraded my Alternator to the highest wattage output available. Car runs good..Underdrive pulley unlocked a lot of power so I cant tell if its lost power. The TICk or Clack..gets louder in gear specially..But seems to subside in idle. regardless of what rpms...Looks like I need a new engine..Im at a loss..Any help would on possible causes or remedies would greatly help.

Naturally ASSpirated,
RockoD2

thanks for the feedback...NOBODY

2 mechs already confirmed its a engine issue..valves etc. Not a header fitment issue.or as i stated in the post...NOT AN EXHAUST LEAK

Noobz347 said:

You have an exhaust leak.

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stanglx2002 said:

It really do sound like you have an exhaust leak based on your OP. Have you looked to see if that is the issue?

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..... this is exhausting.