Back in our March '06 issue, we installed a bevy of bolt-ons to our project 2005 GTO for a 34 rear-wheel horsepower gain. Included in that story was a quality set of Stainless Works' 1.75-inch headers ...
So to up our own ante, we took our Head Poncho to the next level. Because we've been systematically making upgrades to our GTO with what we believe to be the most effective mods for the buck, adding ...
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