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So my 2003 Duramax is %100 stock and I just passed my bullshit smog test today. Im looking to find out what are some good performance mods to start out with but trying to minimize what Ill have to put back on in 2 years for another smog test. Im looking for good quality performance parts and of course better fuel saving options.

Air filter?
Exhaust? (cat back or full system)
Programer?
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Airdog II 165 lift pump for better filtration to take care of your injectors
AFE or Bills Custom intake
Profab turbo mouthpiece
4 or 5" straight turbo back exhaust (this you'll have to reinstall)
efi live tune, either pre tuned ecm or v2 setup, either way you're in good standings. Pre tuned w/dsp2 will be cheaper than most canned tuners if you're trying to cut down on price.

There is tons of useful information found within the forum here, search around for a bit and it will help you out a lot quicker than waiting for replies. :thumb
 
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