Do I need one if I am running M/T et street r's and running mid 12's. Would it be considered a slick or street tire?
People's opinions will vary on what they believe is appropriately safe outside of the rule minimum.
For me, I cannot render any opinion as you've not given nearly enough info. Like car weight, 60 time, and the specifics of your driveshaft.
A long time ago when my car was running high 12s with a 2.0 sixty ft on BFG facials and factory 11 3/4" converter I did not have a loop. But I did have a Denny's Driveshaft built with a 1350 front yoke/joint, but retained the 1330 at the 8 3/4
