I've changed the plugs and it seems like alls well there. What do you guys think would be the best, first course of action on the mods? Increasing the air intake etc....or something else??? And, what's your opinions on each of the different mods? Like, what will add to the quickness, responsiveness versus the speed/horsepower? Also, I've been using some daytona tires which are great for wear but, they're pretty hard and the cornering isn't the greatest. What would be a happy medium as far as pretty good cornering but, something that I won't wear out in 6 months?