B58 Billet Main Caps by 5150 AutoSport Block Rings This intake manifold isn’t just

This intake manifold isn’t just another upgrade—it’s a high-quality

Fits BMW E36 and E34 with M5X motors

perfect for extreme high-boost

Top Speed Limiter Removal: Unlock your vehicle’s true top speed potential

standard repair methods often aren’t enough

B58 Billet Main Caps by 5150 AutoSport Block Rings This intake manifold isn’t just5150 AutoSport B58 Billet Main Caps As power levels climb beyond 1,200+ horsepower, we've seen factory main caps begin to walk. Under extreme cylinder pressure and crankshaft loads, even the slightest cap movement can affect main bearing alignment, oil clearance, and ultimately bearing life. Our CNC machined billet steel main caps are heat treated for maximum strength and feature a dowel pinned design to positively locate each cap and virtually