I went with the ProCharger P-1SC with the 3-core intercooler. That intercooler at the time was the best on the market. I installed it when at the 80,000 mile mark. The car currently has 212,000 miles. I sent the head unit back in once for a new seal. This was totally my fault. I lost a spacer changing a belt and when I bolted the head unit down the pulleys were out of alignment. I shredded a belt. The frayed belt hammered against the seal and made it leak. That is the only problem I've ever had in 132,000 miles.
Unlike Vortech, ProCharger is self-contained. It does not use engine oil for lubrication. ProCharger sells an accessory, an oil line, that makes the drain plug much more accessible. I change oil ever 5,000 miles at the same time I change engine oil. I only use ProCharger brand oil in it.
I use full-synthetic oil in my motor, European blend 0-40. It still has the additives that have been taken out of American oil. I did the dipstick mod. Our oil pans will hold up to 8 quarts of oil without interfering with the crank. A 2000 GT dipstick shows full at 5 quarts. Years ago a member ran his oil pan dry blowing up his motor. He was operating at high rpm with the engine dipstick on add. I know use a 2003 dipstick I bought at Ford. It shows full at six quarts. At 212,000 mile my motor only uses one quart per 5,000 miles. Even at the add mark it still has 5 quarts of oil.
I recommend ProCharger. Mine has 132,000 miles on it and it is still going strong.
ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370.
Ret. USAF 1969-1973,1980-1996: Vietnam veteran. Aircraft maintenance. R & D, ICBM Operations.
Also own: 1997 Harley FXDWG, 1998 F-150, and 2002 Corvette LS1