Unlock the ultimate displacement and power potential of your BMW B58 engine. The ItalianRP 3.2L Stroker Kit increases engine displacement from 3.0L to 3.2L by pairing a custom long-stroke billet steel crankshaft with specialized, high-strength forged components. Available in two targeted tier configurations—the high-horsepower street/track Gold Line and the ultra-pure, maximum-RPM race-grade Platinum Line—this kit delivers unmatched strength and reliability for elite B58 builds.
Required Configuration Options
Please select your kit options before adding to the cart.
What's Included In The Kit
Every ItalianRP B58 stroker kit ships as a complete, precision-balanced rotating assembly including:
- 1x Billet Steel Crankshaft: Custom extended stroke design for 3.2L displacement.
- 6x Billet Forged Pistons: CNC-machined with targeted internal bridging.
- 6x Forged Connecting Rods: H-beam or I-beam profiles matched to the kit's performance ceiling.
- Premium Assembly Hardware: Includes heavy-duty wrist pins, high-seal piston ring packs, wire locks, high-tensile rod bolts, and assembly lubricant.
Choose Your Performance Tier
1. Gold Line Option (High-Horsepower Street & Weekend Track)
Engineered for forced-induction builds targeting 1,000 to 1,400 WHP.
- Gold Line Pistons: Fully machined from 2618-T6 forged aluminum alloy. Features a robust double-bridge structural architecture and a protective galvanic top coating across the crown and upper ring grooves to resist heat erosion.
- Gold Line Rods: Forged from proprietary 34CrNiMo6 steel (44–46 HRC), offering a 20% strength increase over standard 4340 chromoly.
- Hardware: Packaged with ultra-reliable, high-tensile ItalianRP 2500 series rod bolts.
2. Platinum Line Option (Maximum RPM & Unlimited Race Builds)
The ultimate weight-reduced, extreme-strength package for elite race builds pushing 1,500+ WHP.
- Platinum Line Pistons: Skeletonized 2618 aircraft-grade billet aluminum to drop reciprocating mass. Includes advanced triple-bridge architecture, lateral gas porting for flawless high-boost ring seating, and a multilayer galvanic thermal barrier crown coating.
- Platinum Line Rods: Crafted from ultra-pure 35NCD16 motorsport-grade steel, cryogenically deep-frozen to 55 HRC. Delivers an extreme 2,100 MPa yield strength while shaving 20% of reciprocating mass off the Gold Line rods.
- Hardware: Upgraded standard to standard-setting ARP Custom Age 625+ rod bolts.
- Quality Guarantee: Includes a certified material quality and exact mass translation sheet.
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