Chevrolet Silverado 3500 HD Turbo Swap Kit – Wehrli S400, Candy Red (2001–2004). Swap your factory IHI on the 6.6L LB7 for an S400-frame single designed for stronger airflow and reliable performance.

This WCFab kit overhauls the intake and charge path: a 5 in fabricated aluminum intake with heavy-duty air box and dry filter, 3 in hot and cold-side mandrel-bent aluminum tubing, and a 3 in fabricated billet Y-bridge to reduce upper-intake restriction. Stainless braided oil feed and drain lines are included, plus a ceramic-coated 3 in downpipe that mates to your existing front-pipe V-band. The T4 pedestal with spacer accepts popular S400 options (turbo sold separately). Note: forward-facing thermostat housing WCF100405 is required on LB7.

Features

• Candy Red powder coat
• 3 in two-piece hot side with V-band at compressor
• Half Marmon S400 outlet (4.6 in); not HX40 compatible
• Silicone boots, stainless T-bolt clamps, V-bands, heat wrap
• Driver-side transmission dipstick relocation tube

Have fitment or turbo selection questions? Call 512-982-9393 (TX) or 562-981-6800 (CA). We serve Austin, Texas and the Los Angeles, California area with installation and customization. Thinking about multiple items? Contact us about shipping discounts. We install on premises at both locations.

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