That boost is pefectly fine for the intercooler. Runninf 19psi on a std intercooler, is however, silly.

Big boost and poor cooling is fine for short bursts in the lower gears, but hold it for any length of time, and this is where u are likely to run into problems. You are unlikely that she'll melt if the igntion has been set accordingly, but you WILL lose peformance. For example, a track car using a std turbo and cooler, should be set to 11psi max for best peformance, with as much advance as possible.

First mod on an RST should be a good intercooler and breather system