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The factory "Cat-Back" is 2.50". Some aftermarket "Cat-Backs" are offered in 3.00". If you have an aftermarket "Cat-Back" that has 3.00" connections, you would want the to order the 3.00" Catted or Non Catted Section (115-739350B or C)

Dynatech SuperMAXX Stainless Steel Headers, 1 7/8"x 3" 2010 Camaro
Note:The factory "Cat-Back" is 2.50". Some aftermarket "Cat-Backs" are offered in 3.00". If you have an aftermarket "Cat-Back" that has 3.00" connections, you would want the to order the 3.00" Catted or Non Catted Section (115-739350B or C)
