Missed about 85% of the "Fuel Lines and Performance Problems" steps. Strongly suggest you go back and do them EXACTLY as described, don't substitute materials or skip ANY item.

Plugs, filters and maintenance (including the water pump) are shown in the Maintenance section of the Owner's Manual, Service Manual, and of course, the links provided above.

As for fuel and additives: The info provided is based on TENS of thousands of injectors we've seen. At about $800 a pop now, anything you can do to help protect those little round gems we call Direct Injectors is a good investment. We've provided (in detail) the best information and results we have seen: You get the information for free. And if you choose to go a different route and use different fuels, different additives, or nothing at all, that's absolutely your choice.

Just know we've provided you options to best protect your investment. Choose wisely. :)