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I'm a Texas Track rat out of DFW, I've got an STX autox prepped 2014 BRZ (coilovers, swaybars, headers and tune, bushings, brakes, and wheels and tires) and have 17 track days this year so far.
I love my BRZ and recommend it as a track car. I've got the AP Sprint kit and it is a long-term money saver since pads are cheaper and last longer than the OEM sized stuff.
There's not too much extra power to get without going FI but headers and a tune get rid of the dreaded torque dip (E85 with them will add some power, if you don't mind sourcing corn juice).
On 200TW tires (not RE71r's, but Hankook RS4's and Falken Azenis 615k+) I can consistently run 1:25's on the 1.7CCW at MSR-C (1:08 on the 1.3), 2:06's at ECR, 1:50's at MSR-H, and 2:50's at COTA (only went once though). I keep up with Mark Schnoerr in his 1996 E36 M3 and he's at a similar (slightly higher) level of prep and he's been a track instructor for longer than I've been driving (when we're on the same type of tires it's a toss up between us at just about any of the tracks).
An oil cooler, upgraded pads and fluids, and the fuel flapper door are needed for track work (camber helps the longevity of tires, -3F and -2R or so is plenty). A set of BRZ tires only costs $500-$700 and they'll probably last longer than the same tires on a Corvette.
You'll probably miss the C7 power, it's a huge drop for you. A supercharger is always an option. I like the Jackson Racing and Edelbrock kits (they run $3500-$7k depending on new/used, what tuning you go with, and if you install it yourself or pay someone else to do it). A supercharged 86 is pretty close to C7 feel.
Here's me at the SCCA Track Night in America Tuesday chasing a C6 Z06 around MSR-C 1.7ccw:
[ame]https://www.youtube.com/watch?v=8oznTngj124&t=480s[/ame]
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