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I just got my Colorado, and I was wondering what the best add-ons are for the money. I don't want to go crazy yet, just up the HP without sacrificing the MPGs. There seem to be lots of options out there, but what has worked for everyone else? FYI, I'm running a (thus far) stock 2004 Z71 LS I5... HELP!
 

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well i just had my local muffler shop chop of the old can and put on a magnaflow with a dump for a lil over 1 bill. its got a lil resonance but w/e
 

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id imagine the best bang for your buck would be gutting the cat in the exh. manifold. FREE and theres a post i saw with dyno results of 10 hp!
 
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