You're very welcome John, can't wait to see them on your 3dr with those white wheels

You best fit some decent sticky rubber like Porkies 3dr otherwise you'll find out how bad the ABS is (unless you disconnect it)!

Your Skyline sounds mental BTW

Turbo lag:

The Pro5000+ range doesn't use dust seals.
I've had AP race 4pots (no dust seals) on my RS500 for 9 years without a problem, loads of other peeps on here run race calipers on the road too without having seized pistons so yes i'd say they were suitable. If you use aggressive brake pads then i'd make sure you clean the dust off the pistons when you change the pads otherwise yes it can build up and seize.

If I were only using upto a 362mm disc then i'd probably buy the road calipers (CP5555) as they're slightly cheaper but very similar to the above.
NO AP road caliper takes a 378mm disc so you could say thats why these are better!

The CP7040 AP road caliper is also very good value for money but are each 0.9kg heavier than the CP5555 (with 180mm mounting).

AP told me that if you use the road calipers for racing the dust seals can be damaged (split) by excessive heat and would therefore no longer be effective.

I originally bought these calipers and discs to go on my everyday work Mondeo ST220, 15,000 miles & 2 'ring trips a year so I don't think John will have a problem with his road / trackday Sierra.