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Here is a DIY front BBK. You can source the parts from where ever - I got the calipers from the junkyard. I bought EBC GreenStuff, they have good bite, but they're **** dusty.
What you need:
04-05 XG350 (also 04-06 Kia Amanti) front calipers (the 02-03 are also 2pot, but have smaller rotors... this might fit the stock V6 rotors, but not confirmed)
04-05 XG350 pads
06+ Veracruz front rotors
Everything bolts up. Only one thing to note... the XG calipers are mounted "leading", the NF is "trailing" mounted (link - in case you don't know). So you need to flip the calipers around (left caliper on passenger side, and right caliper on driver side). This will ensure the bleeder screw is closest to the top in order to bleed properly.
pics...
Junkyard calipers I bought

cleaned up

rebuilt w/ new pistons

banjo fitting

bottom dust shield (about even but not touching the rotor)

top/side dust shield (about even but not touching the rotor)

top of pads (pad is about 1mm from rotor edge)

bottom of pads (doesn't cover entire rotor ~ 1/4" - I since painted the rotors and this part)

caliper mounted

behind 09-10 Limited alloys (17x6.5 et 46)

caliper clearance from wheels

closer...

Overall, the brakes are a nice improvement... probably mostly from the pads, but still... Pedal feels about the same, but I can feel the difference in stopping power compared to the stock setup. Also, I tried and these will not fit 16" wheels - won't clear caliper. Rears are still stock size... I don't think anyone really upgrades the rears much, also the rears have a larger center bore for the rotors, something like 76mm, but scales down to 67.1mm for the wheels. Another option for the front rotor might include the 11+ Optima SX/Turbo front rotor - they are 320mm, but no aftermarket yet. This also might work for the YF, but someone with one needs to confirm... I measured the distance between the caliper mount holes and they are about 5.0625" (5 1/16).
What you need:
04-05 XG350 (also 04-06 Kia Amanti) front calipers (the 02-03 are also 2pot, but have smaller rotors... this might fit the stock V6 rotors, but not confirmed)
04-05 XG350 pads
06+ Veracruz front rotors
Everything bolts up. Only one thing to note... the XG calipers are mounted "leading", the NF is "trailing" mounted (link - in case you don't know). So you need to flip the calipers around (left caliper on passenger side, and right caliper on driver side). This will ensure the bleeder screw is closest to the top in order to bleed properly.
pics...
Junkyard calipers I bought

cleaned up

rebuilt w/ new pistons

banjo fitting

bottom dust shield (about even but not touching the rotor)

top/side dust shield (about even but not touching the rotor)

top of pads (pad is about 1mm from rotor edge)

bottom of pads (doesn't cover entire rotor ~ 1/4" - I since painted the rotors and this part)

caliper mounted

behind 09-10 Limited alloys (17x6.5 et 46)

caliper clearance from wheels

closer...

Overall, the brakes are a nice improvement... probably mostly from the pads, but still... Pedal feels about the same, but I can feel the difference in stopping power compared to the stock setup. Also, I tried and these will not fit 16" wheels - won't clear caliper. Rears are still stock size... I don't think anyone really upgrades the rears much, also the rears have a larger center bore for the rotors, something like 76mm, but scales down to 67.1mm for the wheels. Another option for the front rotor might include the 11+ Optima SX/Turbo front rotor - they are 320mm, but no aftermarket yet. This also might work for the YF, but someone with one needs to confirm... I measured the distance between the caliper mount holes and they are about 5.0625" (5 1/16).