2001-2004 LB7 Duramax 4" Intake Kit with Air Box Stage 2

More air for the LB7

This Wehrli kit replaces the restrictive plastic factory intake tube and air box on the 2001-2004 LB7 with a fabricated 14 ga aluminum tube, a 10 ga aluminum air box and a dry filter.

It pulls cooler air in through the inner fender, and the 4 in. tube with smooth bends raises intake air speed and volume. Wehrli says that means more horsepower and torque, quicker throttle response, cooler intake temperatures and a stronger turbo sound.

The air box lid comes off for an easy look at the filter, and the water-shedding pre-filter helps keep dirt away from the MAF sensor, turbo and engine.

The kit adds Wehrli's 4 in. high-flow turbo inlet horn, which removes a factory restriction to help spool and top-end power. It works with stock or drop-in IHI-style turbos.

Who it's for

LB7 owners who want a bolt-on intake upgrade.

Key specs (per Wehrli)

What's included

• Aluminum intake tube, 4 in.
• Air box with lid
• Dry air filter and pre-filter cover
• 4 in. intake horn
• Silicone boot, O-ring seal and stainless T-bolt clamps
• Install hardware; powder-coated finish

Fitment notes

• Fits 2001-2004 Chevrolet Silverado / GMC Sierra 2500 HD and 3500 with the 6.6L LB7 Duramax.
• California: Wehrli does not ship this part to California.

Professional install available at Powertech Diesel, Idaho Falls — call 208-542-7793.