I just removed this from my 94 z28,Gm performance opti w/MSD CAP AND ROTOR...Back when i first installed this one of the vacuum ports on the cap broke,but I was able to use a vacuum T and some RTV sealant and it worked just fine..Both pieces have around 1500 miles on them..and worked just like they should...asking 300.00 shipped,including paypal fees..