Re: unichip for 03 Tundra?
Just put mine in 2 weeks ago (2000 4.7). I had the headers, intake, full custom exhaust, etc. and the truck wasn't running right, had a mad lean spot in the midrange. Bought the unichip and installed it (took less than 5 minutes, super easy.) and didn't feel anything until about 75 miles later, when the ECU starts to learn its fuel trims again, fine tuning everything. Now, I would hate to drive the truck without it.
HUGE noticeable increase in midrange torque (although wasn't running well before). Nice noticeable top end bump, also just runs smoother and feels better. like a new truck again. Oh, and the shifting is incredible. much better when towing, seems to not want to downshift erratically anymore. shifts are buttery smooth, if you couldn't hear it you would never know it shifted.
Mine didn't throw CEL on the high octane map, even when I ran it with low-octane fuel. But you can feel a difference between the maps though.
My opinion: grab one before the price jumps again!
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 2000 Tundy SR5
4.7 w/ S&S Headers, K&N FIPK w/ Custom Heat Shields, Unichip, Full Custom Exhaust w/ high-flow cats, Magnaflow 14" dumped, Qtech Exhaust cutout, Bilstein 5100's, TSB'd front calipers, rear AAL, plus some aesthetic and sound modifications
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