M44

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Upgrades

Intake

For most Stage 0.5-1.5 M44, an upgraded drop-in filter is usually perfectly fine and offers a similar power gain to a full intake system. At higher power levels, upgrading the intake system will be more worthwhile.

Exhaust

The stock exhaust manifold is relatively good for OE. Upgrading this component is still a worthwhile investment, and can reduce weight, temperatures, and increase overall engine efficiency.

A cat-back exhaust offers the least gains in comparison to intake and exhaust manifold. 57-76 mm (2.25-3 inch) diameters are ideal, though there is minimal difference beyond 65 mm (2.5 in) diameter at lower modification levels. Please consider the weight difference to power gain and decide what works best for you.

Head

Camshaft

Read the camshaft page for more information.

Valvetrain

+1 mm oversized valves are a worthwhile upgrade. If you plan to rev high, the most important upgrades are valve springs and rockers.

Block

Generally the cylinders can be oversized by 0.5 to 1.0 mm without causing much concern.

Pistons

Crank/Rods

Forced Induction

You can expect between 6-10 Hp per pound of positive pressure added for most forced induction setups. The M44B19 is able to handle 6-8 PSI relatively well without any internal modifications. With just ARP head studs and a quality head gasket, an otherwise stock engine can handle 12-15 PSI relatively well.

Turbocharging

Supercharging