The biggest improvement on my friends Cobra was headers and gears. With 3.73 and headers which we installed on the same day he dropped .6. The week before he ran it totally stock 38k miles tires everything and I got it down the 1/4 in 14.05 at 100.23 the next week with the changes we both tried and ran 13.65, 13.58, 13.61 at around 103 mph. He has done many changes over the winter and spend $400 -$500 over the winter and is still running the same numbers. Throwing money at something does not make it faster just more expensive.
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