Parts by engine

Spring data:
Seat pressure - 77lbs @ 40.10mm
Open (lift) pressure - 180lbs @ 10.00mm
Spring coil bind - 27.00mm
Max lift - 12.20mm
Rate lbs/mm - 10.30mm
Outer diameter - 26.50mm/18.70mm
Inner diameter - 21.60mm/13.80mm

Set includes:
Beehive springs - 32pcs. SPR-BMS65

Product detailed specification
Manufacturer: FCP Engineering
Model: FCPRHB144353622T
Profile: H-beam
C to C: 144.3mm
Big end diameter: 53.6mm
Pin diameter: 22mm (Tapered small end)
Quantity: 6 pcs., 12 pcs. ARP2000 3/8" bolts
Made of: forged steel 4340 EN24er
Advertised horsepower rating: 1000HP (6 cylinder)
Advertised RPM rating: 9000RPM
BMW 135i E82/E88, M135i F20, M235i F22/F23, 335i E90/E91/E92/E93, 335i F30/F31, 435i F32/F33/F36, 535i F10/F11, 640i F12/F13, 740i F01, X1 E84, X3 F25, X4 F26, X5 E70, X5 F15, X6 E71, X6 F16, 335 GT F34, 535 GT F07
Fits OEM pistons

Product detailed specification

Manufacturer: FCP Engineering
Model: FCPRHBS63B44
Profile: H-beam
C to C: 138.2mm
Pin diameter: 22mm
Quantity: 8 pcs., 16 pcs. ARP2000 3/8" bolts
Made of: forged steel 4340 EN24er
Advertised horsepower rating: 1200HP (8 cylinder)
Advertised RPM rating: 9000RPM
BMW M5 F10 - 4.4 V8 (S63B44)

Springs data:

Seat pressure - 85lbs @ 33.5mm
Open (lift) pressure - 212lbs @ 10mm
Spring coil bind - 18.50mm
Rate - 12.50lbs/mm
Max lift - 15.00mm
Outer spring outer diameter: 30.20mm
Outer spring inner diameter: 22.20mm
Inner spring outer diameter: 22.20mm
Inner spring inner diameter: 16.80mm

Set includes:

Dual springs: 16 pcs. SPR-100-BRZ
Titanium retainers: 16 pcs. RET-H1000-BRZ
Seats: 16 pcs. SEAT-H1002-BRZ

Wiseco ArmorGlide skirt coating is a dry film lubricant applied to the piston skirt. This coating helps reduce friction, improving performance, and will also help quiet the piston in the cylinder bore. This coating is permanently applied, and is not a break in coating, it is on the piston for the life of the part.

Spring data:
Seat pressure - 75lbs @ 36.50mm
Open (lift) pressure - 155lbs @ 10.00mm
Spring coil bind - 23.20mm
Max lift - 12mm
Rate - 8 lbs./mm
Wide end spring outer diameter - 24.40mm
Wide end spring inner diameter - 17.60mm
Narrow end spring outer diameter - 21.00mm
Narrow end spring inner diameter - 14.30mm

Kit includes:
Single springs - 24 pcs. SPR-FE20N54-BE
Rretainers - 12 pcs. RET-BMN54-TI (5mm)
Retainers - 12 pcs. RET-BMN54-TE (6mm)