Cometic GM LS1 SB 3.970 inch Bore .051 inch MLS Head Gasket 2006-audi-s4-esi2998045 Borla(r) Cat-Back(tm) & Axle-back exhaust

Borla(r) Cat-Back(tm) & Axle-back exhaust systems feature patented straight-through and multi-core technology to unleash hidden horsepower

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Cometic GM LS1 SB 3.970 inch Bore .051 inch MLS Head Gasket 2006-audi-s4-esi2998045 Borla(r) Cat-Back(tm) & Axle-back exhaustComprised of multiple embossed layers of stainless steel with the outer layers utilizing a Viton rubber coating. Compressed operating thickness is 0. 051". Cometic MLS (Multi Layer Steel) Head Gaskets provide maximum sealing performance for todays high output engines and require no sealants. MLS gaskets are ideal for both aluminum heads to aluminum blocks and aluminum heads to cast iron blocks. They can withstand the shearing force created by the two