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Out of interst did the maths on the piston area's..... Piston area's..... (mm2) Lucas 54(256, 280, 288, 312mm VAG caliper).... 3.142 x27 x27 x2 = 4581.036 Porsche 996/Boxster S rear...... 3.142 x14.5 x14.5 x4 = 2642.422 (2x28mm 2x30mm pistons) Brembo Cupra R/996-Boxster S front...... 3.142 x19 x19 x4 = 4537.048 (36 and 40mm) Ofcourse a sliding caliper is not as efficent as a 4 pot.

You go for DS2500? Interested to hear how you get on.

Not sure if my last post got deleted or i did something wrong.. but here goes. Need to redo the maths on the piston sizes it seems, others I spoke to also worked it out smaller, thats why I did some sums in the first place. The Cupra Bembo's pads are bigger, but no huge. I have both so will take some pics. Back on topic, there are topics on UKMKiv's of people suffering with the 996 rear conversion, a couple(2) that i know have upgraded to bigger calipers and solved the issue of lack of performance... I spoke Awesome and they also said rear calipers belong on the rear of a Porsche. IMO it comes down to the piston size not been large enough... Only have to compare the size to see the difference between the fronts and rears. A member on here I spoke to on the phone said he had to press the pedal harder with 996 rears than std calipers. They look great though.

Pagid RS15's or RS5's are cheaper. You won't get cheap as they are a racing caliper.

Interesting topic. I have a set of 996rears(Same as Boxster S' rears) for the front of my Lupo, The Lupo uses the same 54mm piston size as the 280/288/312 calipers. The Porsche piston area works out smaller!! Thats the reason you have no pedal travel. Your Boxster S' rears have 2x28mm and 2x30mm pistons per caliper, you can do the maths, I CBA, not that much smaller mind. I spoke to Dave Brown(Brake God) he has sold dozens if not hundreds of sets of rear calipers for 312's and customers have been happy, and we decided the Lupo weighs a third less than a Mk4 Golf and I'm limited with size to 15" wheels(for winter), so 996 rears will be OK. I'm only using a 280mm G60 disc, but can swap to 305mm in the summer, using different brackets. but he admitted the piston size is small. Thats why i went for good discs(Brembo Max) and pagid pads. As for pads... RS15's are not avaliable for the rear calipers are they? I went with RS4-2-1's, Dave B recommended them for road use, I have used Pagid pads in race cars and rate them as the best going. RS15's are a MUCH more stable pad than DS3000's, and will work from cold with less disc wear... Downside is the noise. Not fitted the Porsche calipers yet so this is still all just theory for me. If your not limited with wheel size, you need to upgrade to 996 front calipers or simular. I have a set of Brembo's(Seat) that will go on, should these be totally useless. The Leon/Mk3 Ibiza Cupra R calipers use the same size pistons as the 996 fronts. 36 and 34mm? IIRC. 996 Turbo fronts will make it stop, but probably give poor pedal feel. Something else is tyre grip, lack of that brings in the ABS.

Very interesting thread. Got all excited about the ball joint exenders untill I found my Lupo GTI uses the same design of ball joint as the VR6 :( Oh well, I'm sure flipping the track rods over will work on a Lupo :) So thats something. Just need somebody to make the threaded extenders for the BJ's... Are they held in on a taper?