Increase pressure on compair C50

I know this is not normal and will probably invalidate my warranty. I need to operate a rock drill that uses 130cfm at 12 bar, I cannot find a suitable diesel compressor to do it. I do however have a Compair C50, it is rared at 175cfm to 7 bar (100 psi). If I raise the pressure to 11 or 12 bar what adverse effects will it have on the compressor? If it is possible (I know it is not advisable) what do I have to watch to prevent damage being caused? I know I will probably have to adjust the overpressure valve to stop it popping. As I said I know this is not advisable but needs must. Thanking you in advance, Brendon