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So I can end the whos Dick is bigger contest..
http://www.importtuner.com/features/0610impp_catalytic_converter_removal/viewall.html
according to this article, i think all of you that were dogging the 5literbeater guy about showing his dyno sheet owe him an apology, he was obviously right when he said a strait pipe was less restrictive over a cat, which should have been obvious to anyone, reguardless of it being illegal or not. Not everyone lives in states where they are required to have emissions on their vehicles, including me, which im glad i do because its less of a pain in the ass and hole in my pocket when things go bad and need replaced on the cheap side. Not trying to spark another argument or bring up an old thread, i found this when i searched for exhaust related issues and ended up reading the thread, its not really that old of a thread anyways, just a couple months lol. But yea, he actually was right.
Have you thought about the benefits of a G-Force chip? Benefits include an up to 60hp increase, up to 30ft/lb. torque increase, and a 4-7 mpg gain in fuel mileage. All of this can be brought to you for under 70 dollars. This just might be the golden ticket.
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It's been proven having the tailgate down causes additional wind drag in the back, as strange as that may seem. Putting a tarp over the top of the bed supposedly may increase your MPG's but I have serious doubts on that one.
Another way to get better mileage is to let it breathe. I don't know what your emmisions regulations are where you live but you could try cutting out your cats or at least take a rod and blow em out. You can take your cats to the scrapper and make a few bucks there too. Also free up the muffler. If you can find a cheap one that's high flowing put it on. Or cut yours off if you don't mind the noise. Also mod the stock air box. Cut it up so it breathes better. That should gain a few extra mpg's and a few ponies while you're at it. Good luck