Wehrli 01-04 Duramax LB7 Twin Turbo Kit S400/Stock - Candy Red

If you're looking to significantly boost the performance of your 2001-2004 Duramax LB7, this twin turbo kit from Wehrli Custom Fabrication is a serious upgrade. It's designed to work with either an S400 series turbo and your stock IHI turbo, or other S400/stock turbo combinations, opening the door to impressive horsepower gains, potentially up to 1000 RWHP depending on your specific turbo and fuel system choices. This kit is a great option for daily drivers and tow rigs that need more power while also improving fuel mileage and keeping Exhaust Gas Temperatures (EGTs) in check, all while maintaining turbo spool characteristics similar to stock.

Wehrli has put together a comprehensive package here, including everything you'll need for a robust installation. You get a coolant overflow tank with all the necessary hoses, fittings, and a low coolant sensor, plus silicone boots, t-bolt clamps, and v-band clamps. The kit also features a custom powder-coated atmosphere turbo pedestal with an integrated oil return fitting, a 5-inch intake with a dry air filter and Outerwears pre-filter cover, and stainless steel oil feed and drain lines. For airflow, it includes a 3.5-inch cold side charge pipe, a 3.5-inch turbo inlet horn, a one-piece 3-inch Y-bridge with a heavy-duty bead roll, and a 4-inch ceramic-coated turbo downpipe. The candy red finish adds a unique look to your engine bay.

This kit is built in the USA and is recommended for those looking for a substantial performance increase. For setups aiming for higher horsepower figures, like the S475/stock or S480/stock combinations, it's advised to pair this kit with a built Allison transmission to handle the increased power output. Remember, this kit is not CARB approved and cannot be shipped to California.