Right before the car goes into boost there is a clicking noise and an ever so slight shudder. Doesn't seem to want to hit peak boost. There are no CEL's on so I am not sure where to start. Possible boost leak?

Or:

One of the coil packs was just replaced, do you think this could be an issue.

Your thoughts?

 

check the throttle body boot(TBB) for a tare if not do a pressure test.

 

how do you do a pressure test? (link?)

 

http://www.awe-tuning.com/media/pdf/...ure_tester.pdf