I had my RT615s get a little sloppy at Talladega (slow course) in my 86 N/A... I'm not sure if the 615Ks are an improvement, but if they're like the 615s, I'd probably not recommend them for a faster car/track.
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1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles
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