BTR: LT1 .660" or .685" Double Spring Kit [Corvette, Camaro, Truck, LT1, L83, L86] calvo Custom ATS-V specific hand-crafted mufflers

Custom ATS-V specific hand-crafted mufflers Designed to flow 35% over stock when valves are closed

Will work on modified LS1/LS2/LS6 engines also

513-662-4000 or Sales@Weapon-X

Inherent is a rise and fall in pressure which takes time to achieve

We picked up our C7 ZR1 over 4 hours away and made it all the way home with one of these and the front end was still perfect

BTR: LT1 .660" or .685" Double Spring Kit [Corvette, Camaro, Truck, LT1, L83, L86] calvo Custom ATS-V specific hand-crafted mufflersOption 1: . 660" Lift Dual Spring Kit for Gen V engines using stock rocker arms. Includes dual polished springs, matching Gen V specific titanium retainers, your choice of locators for stock or bronze guides, locks and seals. Spring specs are 155 lbs @ 1. 780", 380 lbs @ 1. 180", 400 lbs @ 1. 130, coild bind @ 1. 070" Option 2: . 685" Lift Dual Spring Kit for LS engines using Limited stock rocker arm setups and Roller Rockers. Includes dual springs,