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WeaponX pulley and belt charts are all kinds of jacked up. Their charts have failed my twice on what belt will fit what combo.
It sounds like you are on pump 93 only and not E85 since you didn't mention it.
Bigger lower pulleys are always better than smaller upper pulleys. A bigger pulley equals more belt contact (less chance of belt slip). I had a 9.55" lower and Griptec 2.3" upper (on E70) and experienced a lot of belt slip at the upper.
If you are on 93 only, then a 9.45 or 9.55 (depends on brand) lower with a stock upper will put you near the top of the "safe street" boost levels with 93. You could run a 9.55 lower and 2.3 upper on 93, but it would really be pushing your luck IMHO.
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