"So far, the best bang for the buck seems to be a low restriction air filter in the stock air box, coupled with a better flowing exhaust. Chip tuning and turbos get you more performance - for a lot more dollars. YMMV.
Setting the clock is a very common struggle for some people. I imagine that these things are difficult to explain in writing without somebody just doing it for you. So I believe you are most likely not setting it…"
"Yes, you can, __at your own risk__, modify the engine as you see fit. Upgrading the air filter is going to be a very minimal performance improvement if any at all. You might want the K&N upgrade simply because they pretty much…"