the S281SC is "quicker", (GT) solid rear & blower with about the same boost, better suspension setup. stock vs stock the Saleen 281SC (GT) is a 1/2 sec quicker in the 1/4, look it up, but for 9 to 11K more money, it should be, but you have to drive around with the "ricer" wings and lettering, I went with the cobra, put about 6-7K into my 04 and now I'm 1 sec quicker than the Saleen, with IRS and a 6 speed.