GMC Duramax LB7 Twin Turbo Kit - Wehrli - S400/Stock - Chevy Orange - 01-04. A compound turbo solution for 2001-2004 LB7 trucks that delivers strong drivability with stock-like spool and crisp response.

Built by Wehrli Custom Fab for daily-driven work and tow rigs, this S400/stock kit broadens horsepower potential, helps fuel efficiency, and improves EGT control with proper supporting mods. Works well with common combinations such as S475/stock IHI for quick spool, S480/stock for stronger top end, or S480 with a 64mm drop-in. Not compatible with Banks intercoolers; contact us if you use a Banks charge air cooler.

Features

• Fits 2001-2004 GM Duramax LB7; Made in USA
• S400/stock compound layout; turbochargers sold separately
• 3.0 in one-piece Y-bridge (HD bead roll), 3.5 in cold-side pipe and inlet horn
• 4.0 in ceramic-coated downpipe; 5.0 in intake with dry filter and Outerwears cover
• Coolant overflow tank with hoses, fittings, low-coolant sensor
• Stainless oil feed/drain lines; silicone boots; T-bolt and V-band clamps; heat wrap
• Atmosphere turbo pedestal with built-in oil return
• Driver-side hot intercooler pipe not included (WCF100349 sold separately)
• Requires passenger-side battery relocation; Chevy Orange powder coat

Have questions on turbo choices, fueling, or transmission support? Call our team. We offer installation and customization at our Austin, Texas and Los Angeles, California locations: 512-982-9393 (TX), 562-981-6800 (CA).

If purchasing multiple items, contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov