Quote:
Originally Posted by Gen
So forgive me ignorance, but I have to ask, if a simple tune can increase engine power a fairly significant amount while increasing MPG, why would Subaru and Toyota have left it as is? There must be some reason. I don't imagine there's a significant emissions difference between stock and flashed. How much does this tune lean things out?
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Car manufacturers have to leave some wiggle room in ignition timing just to be safe and reliable. Not saying your car wont be reliable with a tune. Manufacture leave room for error such as clogged air filters, dirty plugs, minor faults ect.