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Catbacks seem ridiculous, especially on the Eskys and Denalis, where they use smaller pipes then stock. Stupid. The stock 3.5" pipes create quite a racket inside, but they flow better then a 3" system will.
So on my 07 SLT I need to pickup a set of 2.75 to 3 expanders? I'd rather pick some up at the hardware shop so they don't over charge me at the garage
no you dont they can weld it in fine.