I went the procharger route. I got the p1sc-2. This IS a different blower than the p1sc. I also did cobra tank and pumps, power pipe, and a couple other little things. The car made 427rwhp and 425 rwtq. This was with no timing into the car(left at 13*) and on a safe tune. Ive put about 4000 miles on the car and the only problem Ive had is the fuel rails leaned out which the tuner told me would happen. The motor never blew up thankfully. The car turned 438rwhp with 18* timing but to be safe was turned down, so the potential is definately there. This was all done on stock block, cams, and heads also. The motor is now being built from the bottom end up and I will be shooting for 600 rwhp.