I know what you mean. I had a heavily modified GTP which was running 15 psi. While it didn't have the power of a Ligtning as soon as you hit the gas you were being pushed in the seat and it didn't let up.
In the Z it is more progressive but once you hit that 3500 rpm range hold on!
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Brian
01 Quicksilver Z06, Vortex/Powerduct, CAGS, B&M Ripper, Lowered, Frame Savers
TIPS Long Tubes on the way!