i dont remmeber exactly what part of the exhaust it was but there is a really restrictive bend that is really bad, exspecially with increased boost. Im sure someone will chime in and give you exacts. BTW i have a full flowmaster exhaust on mine with roughly 5% od and its now pushing 15 pounds, so with a 10 and relatively stock exhaust you are going to have soo much back pressure that the gaskets will pop, maybe not tomorrow, or next month but they will go for sure. Also depends how many miles are on the car right now.
Another thing to think about is heat, our blowers are pretty efficient at creating boost with the stock pulley, anything smaller creates more heat which in turn will affect detonation and the computer pulling timing in order to counteract this. i would say at the very least get an ic fan, or double, and if you can get a front mount. Also with 10% with the stock intake you will starve the blower it will be wanting so much air but can only deliver so much, and if you increase air, and boost you need more fuel eventually