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Replaces 3910
Tested to 570+ wheel horsepower
The L5P Screamer for 2017-up Duramax engines feature custom compressor and turbine wheels that have been designed to give you increased airflow without compromising on low end performance
Upgrade supports
1 inch tall OE style cast iron rear blocks with U-bolts
HSS FR3 8oz Oil Friction Reducer HSSFR308Z downpipe Replaces 3910FR3 Oil Friction Reducer FR3 Friction Reducer is a lubricity enhancing oil additive that increases the lubricating & wear reduction properties of the host oil. The product contains three proprietary synthetic lubricants that have unique lubricating properties even compared to PAO or mPAO synthetics of the same viscosity. The anti wear component of the formula is an exclusive carbon nano lubricant that fills in microscopic irregularities on the