This weekend, i did a lite tune-up on my bull. I opted to pay a little more and buy some nice plugs, so i bought Bosch Platinum +2 Yttrium core plugs. My car LOVES these plugs. My last plugs were Bosch Platinum Pluses, and they had been in the car over a year before i noticed even a slight hesitation and increase in fuel consumption. Total cost for plugs was around 30 bucks, and i say they are well worth the price. I used to buy Autolites, but now i always use Bosch.