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.

Kit Tier Line:
- Gold Line
- Platinum Line

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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BMW 1 Series

M140i (F20/F21) - 2016-2019

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M240i (F22/F23) - 2016-2021
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340i (F30/F31/F34) - 2016-2019
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640i Gran Turismo (G32)

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BMW X Models

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BMW Z Models

Z4 M40i (G29)

Non-BMW Vehicles Using the B58

Toyota GR Supra (A90/A91) 3.0L

Options	SKU	Price
Piston & Rod Line: Gold Line; Crankshaft Line: Gold Line	IRP-SK-B58	$7,999.95
Piston & Rod Line: Platinum Line; Crankshaft Line: Gold Line	IRP-SK-B58	$8,999.95
Piston & Rod Line: Platinum Line; Crankshaft Line: Platinum Line	IRP-SK-B58	$10,399.95

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BMW B58 3.2L Stroker Kit by Italian RP