Wehrli 01-04 Chevrolet 6.6L LB7 Duramax S400 Twin Turbo Kit (No Turbo) - Bronze Chrome

Wehrli Custom Fabrication is known for building robust performance parts for diesel trucks, and this S400/Stock compound turbo kit for your 2001-2004 Duramax LB7 is a prime example. If you're looking to significantly increase horsepower, improve fuel mileage, and gain better control over your Exhaust Gas Temperatures (EGTs), this kit is designed to help you achieve those goals. It's recommended for daily driver work trucks and tow rigs that need more grunt without sacrificing too much of the stock turbo's spool characteristics.

This kit is designed to work with a stock IHI turbocharger as the primary unit, paired with an S400 series charger as the secondary. Depending on the specific S400 turbo you choose and other supporting fuel system modifications, this setup is capable of supporting up to 1000 rear-wheel horsepower. For example, pairing it with an S475 turbo can get you up to 750 RWHP with good spool and performance on stock fuel setups, while an S480 can push past 800 RWHP for better top-end power. For the most demanding setups, an S480 with a 64mm drop-in turbo can achieve over 900 RWHP.

You'll find that this kit comes with a lot of the necessary components to get your twin-turbo setup installed. It includes a coolant overflow tank with all the hoses and fittings, plus a low coolant sensor. You also get silicone boots, t-bolt clamps, v-band clamps, heat wrap, and clamps. The kit features an Atmosphere Turbo Pedestal with a built-in oil return fitting, a 5-inch intake with a dry air filter and Outerwears pre-filter cover, stainless steel oil feed and drain lines, a 3.5-inch cold side charge pipe, a 3.5-inch turbo inlet horn, and a 3-inch one-piece Y-bridge with a heavy-duty bead roll. The 4-inch downpipe is ceramic coated for durability, and the entire kit features a durable custom powder coat finish in Bronze Chrome. A 3-inch cold side intercooler pipe is also included. This kit is proudly made in the USA.