you said its got new plugs, what plug are you running?

need those screen shots too

 

you said its got new plugs, what plug are you running?

need those screen shots too

 

im running the NGK TR-6....im still working on getting the screen shots..I am at the mercy of my tuner because im trying to obtain the map curve screen shot from him.

 

I would say a turbo mismatch is not out of the question, it will work but maybe smaller would've been better. some ls1's run a single t66. You have two so thats 3.0 liters to one t66 . Your could kindof compare it to supra running a t66 which is not lightning quick spool, downside is you can't run the high rpms a supra can.

twin 62-1's could get you over 1000whp so if your goal is lower there is no need for the twin 66's.

do you have the f1 65 turbine wheels or the f1 68 wheels?