Over here in the UK, we have very limited suppliers/manufacturers that can offer 2 or 4 pot caliper upgrades with higher spec discs (rotors) that can go behind standard 15" wheels.

Can anyone advise me of any US suppliers/manufacturers that offer this upgrade?

 

Same here, but I think Spoon sells them, maybe StopTech too. Also FastBrakes, which use Wilwood calipers (not street use unless you rebuild your calipers every year or so).

Have you tried better pads and brake fluid first? Very few people seem to have complaints about ITR brakes after upgrading pads and multi-piston calipers will only improve feel and modulation on 11.1" rotors.

 

how about legend rotors........nsx calipers?

 

Or legend rotors and legend calipers.

Just put mine on this weekend. Smoother fell and seems to have a better initial bite.