I was in the same boat as the OP, and went with RT660s.
Federal 595 RS RR
Wear earplugs. They're great.
660 is good bang for the buck. Not as fast as the top tier tires but two or three times the lifespan.
I went with fallen 615+ not the fastest but should last a good number of runs
I'm in a similar boat as you I did the 615k's last season. Personally I am overly pleased with these tires they have been everything I've wanted them to be. And I'll probably get another set of them this year.
The 615k+ is a great budget tire. I did my first season on them and got second place in my regions rookie class. Then, I kept them and still use them for less competitive/ higher run count events. I've done 3 schools on them too. I love these tires. They're fun to drive on, take heat well, and just last. They do amazingly well in the rain also.
They are Falken Ziex ZE950 A/S
Rt660 I have mixed experience with, on fwd with a narrower size they came apart and wore out quickly. In a rwd 315 application they seem to last forever
I don't like the Falken Ziex that comes with the 17 inch wheel.
Falken RT615k+ on BMW 135i here. They are toast with less than 5k miles on them.
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