I've noticed I've been getting some bad gas mileage lately. The lines go down pretty quick and I drive it pretty nicely. At 98K miles and I think its time for a nice tune-up. Is there a 100,000 miles service or tune-up? I am thinking to do a tune-up anyways for it. Here is my list I was thinking of changing, and lemme know if you think its a bit over the top.

• Air Filter
• Spark Plugs
• Fuel Filter
• O2 Sensors
• Catalytic Converter
• TCT (needed)
• Valve-Adjustment

Also, do Magnaflow universal cats work? Hiflow cats? Anything thats not an arm and a leg in cost? Suggestions?