I have a 1997 Z/28 and I have done about every simple bolt on modd possible and I'm am still not satisfied. On my quest to a lower ET and keeping my car emission compliant has become a challenge. I am currently looking to convert my LT1 to a LT4 with a cam, heads and intake swap. I have received many mixed reveiws on this, some say that as long as my computer is programmed correctly it will pass while others say it will not ... can someone help me out here please ??? I'm really interested in this because it should put me past the 450 hp mark with my current mods....THANKS EVERYONE