i have tracked at houston MSR on the AP 13.5 inch / 6 pistons set up in my na slicktop with 0 fade, i braked with extreme confidence. this what with hawk HP pads with a lot more "bit" than HPS (street low dust pads). If tracking swap out to HP VS HPS because the HPS dont have near the power once hot. PAD size compared to a stock pad is about 30-40% larger... Now i do have the 4 piston 13inch 1 pc kit on my convertible but i cant speak for its road course track performance, it steer performance is great on hps pads, but if your going to track it swap out pads. you will find the AP 6 piston kits pads are much larger than stock/ sti evo brembos. also AP calipers to be much lighter than the SRT-8 swap which is very heavy also dont forget about royalty performance rear upgrade kits i have a few brackets left in stock.
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