Scientific studies show that the comparison of which is faster between a stock 1995 5.0 vs a stock 1996 npi 4.6 can only be done at the track, while being closely monitered so no B.S. can be added to the scientific formula. It is also necessary that the track be cleaned of small children, kittens, ping pong balls, and any debree that might attribute to B.S. being added to the scientific formula.