These are my times as of last night. Only difference is a new opti, cap, and rotor, hallowed the cat, and opened the cutout. These seem really quick to me for a basicly stock Z28. Is my car possesed or something, lol? I was actually getting slightly worse 60ft. times, so that eliminates track prep. Is it just because of the cutout and no cat, or was the cap and rotor hurting me that bad? Here is my best slip from last night....

60 2.058
330 5.783
1/8 8.843
MPH 80.73
1000 11.495
1/4 13.735
MPH 100.84

Here is my old best, before I did the above work...

60 2.018
330 5.828
1/8 8.944
MPH 79.29
1000 11.648
1/4 13.939
MPH 98.48

 

Back when my car was new and stock. With a tire it went 13.3 @ 102. That was with an automatic transmission. I think its running ok. TTYS

Vince

 

I think it is the cutout and the hollowing of the cat that would be what helped more than anything. I mean, its not like you gained alot...but it is running noticably better. Plus looks like you gained more on top end....in the 1/8 you picked up .1 and about 1mph....in the quarter you gained .2...and 2 mph.