GMC Sierra Twin Turbo Kit – Wehrli S400/Stock, Sparkle Bomber Orange (2001–2004 Duramax LB7). This compound setup pairs an S400 atmosphere with your stock IHI to deliver stock-like spool, cooler EGTs, and serious power potential with the right supporting mods.

Built for work, tow, and daily use, it is 1000 RWHP capable depending on turbo and fuel upgrades. Suggested combos: S475/stock for up to 750 RWHP and quickest spool; S480/stock for 800+ RWHP and stronger top end; S480/64mm drop-in for 900+ RWHP with moderate spool (WCFab 750+ built Allison recommended at higher power). Not compatible with Banks intercoolers—contact us if you run a Banks charge air cooler (additional cost/lead time). Requires removal/relocation of the passenger-side battery. Hot/driver-side intercooler pipe sold separately (WCF100349). Turbochargers not included.

Features

• 4" ceramic-coated downpipe
• 5" intake with dry filter and Outerwears pre-filter
• 3" one-piece Y-bridge with HD bead roll
• 3.5" cold-side charge pipe plus 3" cold-side intercooler pipe
• Atmosphere turbo pedestal with built-in oil return
• Stainless oil feed/drain lines; silicone boots, T-bolts, V-bands, heat wrap
• Coolant overflow tank with hoses, fittings, low coolant sensor
• Durable Sparkle Bomber Orange powder coat; Made in USA

Questions or planning an install? Call our Austin, TX shop at 512-982-9393 or our Los Angeles area shop at 562-981-6800. We offer installation and customization at both locations. If you’re considering multiple items, contact us for shipping discounts. We install on premises at both locations.

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