manley chevrolet big block exhaust valve kit 1 940in head dia 5 522in o a length 0 3415in stem 1998-jeep-grand-cherokee-esi6831610 52121614AD

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Optional front muffler 60561 can be added to replace the Merge X-Pipe for addtional sound control

Five pre-set power levels adjustable on-the-fly

You can also paint them to match or accent the body color for a factory-custom look

manley chevrolet big block exhaust valve kit 1 940in head dia 5 522in o a length 0 3415in stem 1998-jeep-grand-cherokee-esi6831610 52121614ADDiscover the extraordinary capabilities of Manley Performance Products' Extreme Duty Series Valves. Engineered to cater to the demanding needs of Top Fuel and Funny Car drag racers, Big Block Chevy marine enthusiasts, and Small Block Chevy restricted carburetor circle track competitors, these valves are your ticket to unparalleled performance.