Boost is holding up beautifully...I originally had the same belt and after approx 15k miles I started to get belt slippage at 4-4.5k rpm shifts. I purchased the BWoody Anti-Slip idler Pulley V2 off a member here and purchased a brand new belt from Gates. I had my Tech at my dealer install it. We were a bit hesitant but after installing it and he checking the play he said I was good. I havent had any issues so far and holds boost at 17psi.