In a previous post I mentioned a strange 'new' sound during redline 2-3 shifts. Thanks to those wonderful folks @ RPM Racing in LI, the problem seems to be the belt tensioner. There is a mark above the alternator which indicates a range (+/-3/8"?) for adjustment. Right is tighter...mine was nearly all the way to the left, allowing the belt to 'slip' @ high rpm in that moment of slack during a hard shift. This may help others out there.
PS: 25k and this is the first little item to address in 2 years.

 

Glad you got it fixed. Good service record for your car.