I'm sorry if this has been covered a number of times before. I've read a lot of different posts about this and just wanted to see if there is a more up to date "modern" solution for this problem.

While engaging the clutch (releasing pedal) I notice an audible click/pop noise coming from what seems to be the transmission. Sometimes it clicks just once, other times 2 or 3 times in a row. My clutch seems to engage a bit differently than before the click started. Prior, it was more on/off and grabbed sooner (Competition Clutch Stage 2) and now it seems to slip the slightest bit before fully engaged. I'm not sure if it's just mental, but the car seems to have lost some power when given more gas than before too.

Some solutions/causes I've read are: axle nuts needing tightening, drive shaft and/or cv joints loose in the differential, differential gears not meshing properly (going bad), and clutch release bearing going bad.

Some things to note:
1) 2005 model - most likely meeting 220ft/lb axle torque spec from factory (not in 01-02 TSB)
2) Aftermarket clutch/pp/release bearing - CC Stage 2
3) Click/pop was noticeable on stock clutch, but not on aftermarket until now (5k miles later)
4) Seemed to start after I had installed Denso IK22G Iridium plugs last weekend. Probably not related but worth mentioning.

If anyone can chime in and give me some insight based on this information I would greatly appreciate it. I can't take a good look at the car until this weekend when I'm not working. Thanks in advance.

 

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Update: After realizing that my torque wrench only went up to 150 ft/lbs, I took it in and had it inspected at JC Honda here in San Diego. Surprise, surprise it was the axle nuts. So even cars built after 2002 can have the issue.