My buddy and I raced his 85 shelby charger again. His best time was 15.9 @ 87. (10 psi)

Here are my runs:

Perfect R/T is .500
R/T.....60ft......330ft.....1/8 . . . . . . . . 1/4. . . . . . . . . . .boost

.505 .. 2.247... 6.643 .. 10.299@67.06 .. 16.1749@83.65 .. 7 psi
.506 .. 2.229 .. 6.599 .. 10.249@66.59 .. 16.131 @83.52 .. 7 psi
.559 .. 2.371 .. 6.683 .. 10.217@69.24 .. 15.8681@87.38 .. 10 psi
.507 .. 2.400 .. 6.581 .. 10.146@68.31 .. 16.2351@78.69 .. 11 psi (OVERBOOST!)

The car is stock except exhaust. The engine is a 2.2 TI LOG. For exhaust, it currently has 3" to the rear axle, then goes to 2.5"

Any comments, or suggestions?