About anything are better than the stock exhaust manifolds. They are terribly restrictive. I wanted MAC's, but I waited months and they never would build me a set for my 1996. Hopefully you can get a set without a problem.

They should be worth some good gains. I picked up 0.4ths and 5mph in the 1/8th mile with a switch to long tubes. Very impressive gains.

The Kooks I got were expensive, but well worth it.

 

Nice looking Z28 !! Sounds good also. Engine area looks good. I like the valve covers and the kooks look sharp.