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2006 GMC Sierra 1500 Z71 Crew 5.3L True Duals Flowmaster 40s 2.5" Stock Cats H-Pipe

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Uploaded by on Jul 31, 2009

2006 GMC Sierra 1500 Z71 Crew
5.3L True Duals
Flowmaster 40s
2.5" Pipe all the way through
Stock Cats
H-Pipe just put on

  • likes, 1 dislikes

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  • I would say the H pipe mellowed it out a tad.

  • do you get any more hp or better mileage after doing this?

  • is that a 2 into 1 or separate

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