Porting the outlet by increasing it'* size generally isn't good practice. The outlet isn't the restriction, and you can decrease the Supercharger'* efficiency. The INLET is the problem.

Correcting certain inefficiencies at the inlet and cleaning up the roughness inside can make good improvements.

Bad news for me.

Some kid with 98 Grand Prix GT found the 00 GTP with TOGS and swapped the exhaust and manifolds before I could get mine off my GTP parts car.

So I only get the junk motor, ported SC with nherbst454 3.2" MPS, and 3/4" phenolic TB spacer.

I talked to the kid, thinking he might have lost some power as I did when I put the 3" exhaust on my Series I L67, but he says he has so much more power now over 30 mph. (I was hoping otherwise) :(

I am going to offer him $250 and a set of ceramic coated/ported manifolds for them but in about 2-3 weeks.

You called to tell me about parts that weren't in your hands already?

Sorry to hear...