is KB's 2.1 kit a 6 rib drive

[jeffs]

04 Cobra owner here and was pondering through these pages a bit to check out what people are accomplishing with these cars. I noticed most people are using the KB's 2.1 and rightly so as it gives you a comlete intercooled kit. But I think I noticed that it only uses a 6 rib drive belt system?

I'm guessing if you kept the boost fairly reasonable that belt slip wouldn't be too bad, but say you stepped up the bottom end of your engine later and wanted to pulley up to 15psi or so, would you be OK or would you have to lay down alot of money for 03/04 cobra parts to get an 8 rib drive?

Anybody here running in this boost range with the 6 rib set-up? I'm running a D1 procharger set-up on my 01 4wd f150 at around 12 psi with a 6 rib and it always slips on the first throttle stab, but it's kind of like a burn-out at the drag strip, after heating up the belt and pulleys with the slippage from the first romp, she's good to go without any slip, but I also have very good belt wrap on that procharger.

I love these mach-1's but I'm pretty sure I'd want more than 10 psi of boost at least someday.