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Tell us more about your car. Stick? Tires?
A 125 shot in low gear might turn you around in a hurry.
I think you also want to make sure the traction control is off before use.
125 horse is like adding heads, cam and headers at the touch of a button.
I think it may be smart to start at the low end of the scale and work your way up.
Your Corvette should not be slower than his car over the course of the quarter mile. How does he know it's faster? I'm assuming you've gone head to head? However, when talking half a second difference, it is all down to the driver.....but nitrous will put that to rest.