Suspension Upgrade and Weight Check – 3855 lbs By ATI in 10R90 June 7, 2017 Getting some BMR suspension parts and a quick weight check. We have the stock muffler system with valve control back on it for anyone looking to reference weight I would guess we are 15 to 25 lbs lighter than stock and have 1/2 tank of fuel. Tags: 10L90, 10L90E, 10R90, 10R90E, ATI, ATI Performance Products, ATI Racing, BMR Suspension, Featured, ZL1