Is it worth taking these SAT Subject tests.

this is my third post here. anyways, if anyone has ever had any info on UT Austin mabye you can help me out. Altough i know UT doesnt require the subject tests, if lets say i take the math 2 and get an 800, would that be helpful for admission? im applying to the cockrell school of engineering. Kind of just wanted to know if its worth it to take it or if they wont even glance, thanks

oh and im also a texas resident and top 7 percent so i have auto admit to ut, just not cockrell.