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Just to follow up/confirm -- these do indeed fit, and the only two modifications you need on your S13 are:
1) Drill-out your knuckles to accept the larger 14mm brake caliper bolts
2) Cut/grind the caliper bolts down by about 6-8mm in order to clear the back of the rotors
OEM S13 brake lines work - no investing in new 4-pot lines!
Basically the same as for an R34 brembo or Z33/CPV35 Brembo kit.
First impressions: Pedal is definitely softer than with OEM 280mm RPS13 rotors and calipers, but not uncomfortably. Haven't had a chance to get the guy up on the twisties but will report back on that later.
Fills up the 18" wheels much more nicely. (320mm rotors!)
Will fit under most 17s I'm 90% sure... but while it also looks like they might fit under 16s, it would be really tight, and would depend on rim and face design. The twin caliper setup gives you more room between the caliper and the back of the wheel face/disk - so you can get a fatter lip!
Enjoy!!
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