Both are pretty easy to Install The big difference between the two is Stillens require some small cutting. Stillen has a little more hp gain but are more expensive than Injens. The Injens are a great choice if you don't wont modify anything, plus the Injens come with a replacement washer fluid tank that needs to be changed to make them fit. You may just have a shop install them if you have no time and no place to do it in?. I'd lean towards the Stillens. both are not carb approved but won't affect emissions output. There are plenty of DIY's on Injen and Stillen to search from, if you decide to do it yourself.
Give Lou at Amplified a call for a price + labor, he's a good vendor and sells both? or Calll Stillen also.
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STILLEN : Precision Performance Components for Your Car or Truck