you can use MS squirt n spark on an SRT4 now...just mount the EDIS trigger wheel and convert to ford EDIS, its really not that hard, plus you can eliminate a lot of needless complexity of the stock computer...and for you weight reduction freaks, the MS weighs in at maybe 1/3 of the stock computer's weight, and comes stock with a 2.5 bar map sensor(20-21psi) (optional 3 or 4 bar) not to mention you can add whatever circuit you want in...want computer controlled nitrous? want to make your radio turn on at full volume when you hit boost?(not sure why you would, but you could do it) and the #1 best thing about MS....it datalogs everything you want and need to see(you may have to make an input for things like EGR though) not bad for $320 shipped, heh sorry I am just abig MS fan now