A muffler upgrade is a key one. That will increase mileage. You could also consider supercharging, though that is going to change the cosmetic appearance a lot.
Cold air intake is a big one, along with mufflers. I think those are the most two common, as they are also simple to do.
Do you think changing the cold air intake makes a big difference to you? I've never done it but I have heard good things from some friends of mine who have changed their cold air intakes.
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What are some common upgrades?
Linear Mode
