The claim of this chip is absolutely bogus to me. If anything, the chip itself would provide a more aggressive fuel map, ignition, and timing, but nowhere near 50+hp IMO. A toyota engine at 150k should be showing some signs of age, but adding this chip isn't going to grenade it. You're better off leaving it the way it is, instead of trying to squeeze more horses out of it. Not saying it can't be done, but it's not like you'd be adding much resale value to it.
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