My nitrous system has a problem. My car goes 85 mph in the 8th with it on and 78 with the motor. Juiced or not I go 100 in the quarter. What could be causing my problem after the 8th mile? My computer is not pulling timing and I have no detectable clutch slippage. WTF????

I also have two fuel pumps and a hobbs switch that shuts the Nitrous off in the event of less than 35 psi. I know for a fact that the soleniods are on for the entire pass. Any suggestions??

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1991 Firebird
350 L98 (was a 305 TBI)
T-5 transmission
Edelbrock TES and cat back
Accel manifold
NOS
subframes
jegster torque arm
MSD Digital 6
AFPR
Lakewood lcas
hurst linelock
SLP cam
relocated battery
cold air
Hypertech chip
centerforce clutch
poly bushings and mounts
etc..

14.1 @ 99mph with just headers and catback

with NOS and other mods???? twelves??