If its popping out of gear alot, I'd check for a bent shift fork or slider rail especially since you're still running a stock shifter. Bent shift fork/slider can also make it hard to get out of gear. The stock shifter will kill a T5 in a short time if you're an aggressive driver.
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Jeff Chambers
Trophy Stock #3
11.86 Seconds / 113.8 MPH
Chambers Racing Team