Well I did...because when I bought the Saleen almost 4 yeats ago, that was the most powerfull car with a warranty. At that time the cobra was rated 320HP, and the Saleen 350HP with beeing the best looking car, a limited edition, better wheels ,
suspension and so on.
Today I'd rather buy a 03 cobra and put the saleen kit, wheels and
suspension on it.
Or if you buy a Saleen to avoid the hassle of body work, just get it N/A and put the 9 spi KB on it and you'll have a 500HP car, about 100HP more than a stock 03cobra and 50+ HP more than a S281-E !!!
The Saleen blower (Gen I, II, III or even IV, V) just sucks. You can try anything to it (pulleys, long tubes, X-pipe...) you won't improve a bit, maybe 10 or 20HP...big deal! . More boost will give you more heat but not more HP. Just your gas mileage will be worse, that's for sure !
By the way I have a Saleen blower for sale, good for 100HP over stock , no more...