The s1x is inbetween the VS and XP in size, but the powerband is broader meaning you'll have to rev that cam more than the other two to get everything out of it. A stout VS setup would have no problems with an srt 8. Hell my setup ran a 13 flat with all sorts of kr due to a bad intercooler pump. I'm sure it would have performaed just as well as my xp set ups, only it didn't need to rev high to do it. I'm willing to bet there's a 100,000 mile life expectancy difference between a vs cam car and an xp/s1x car if both are tuned to take advantage of the powerband of the cam. For anyone who dd's thier car, I'd always recommend a vs. It's the best 3800 cam and it makes a ton of power everywhere in street revs. The trade-off in durability vs power on a scale of 1-10 is a 10 to 1.