67pete300,

I would try a crossover tube to help with the raspyness of the glasspacks.

I know first hand they help w/V-8's, but not sure if it will w/a inline? I would tend to think it will help.
I used to run dual 2" w/turn downs before the rear axle then switched to a single 2/5" exhaust to the rear bumper, which BTW,was quiter.
I would try it out & see first hand results.
http://shopping.yahoo.com/search?p=crossover%20tube%20exhaust

MBHD

12 port SDS EFI