just as with almost everything electronical, you get what you pay for in car audio.. JL is an awesome brand, a bit overpriced IMO, but all of their products are good quality.
they are pricey, but you get what you pay for. they are EXTREMELY clean sounding, the set i listened to at a local store that sold me on them was powered by a 500 watt MBQuart amp. No distortion, even at extremely high volume levels. I was sold on them the second I heard them. But if you are just looking for something quite a bit better than stock. Might look into MBQuart, JL Audio, maybe Polk Audio as well
Auto. Transmission Fluid is fine, so is 10w-30.The Transmission fluid will require a change more often than the oil, but IMO, shifts smoother. Some will argue the ATF causes "creep" , but thats never been an issue for me.
2007 Special Edition YFZ 450. Does NOT run. Traded for it a while back, am moving soon, dont have time to mess with it. Pretty sure it needs new crank bearings. Motor turns over, has good spark. Clean/Clear Title. $1800 obo.
call up a builder (Passion Racing, Herr Jugs Racing, Redline, Fast, Wildcard) will all get you where you want to be.. ask them anything you want to know, they will have an answer
call one of the site sponsors ... but your gonna need your cylinders ported for the 4mil, 33pwk's would be a good choice for carbs, get a cool-head and have one of the site sponsors get you set up with some domes for your fuel, elevation, etc.
50/50 is wayyyy too much antifreeze,,, i usually do around 25% antifreeze, 50% distilled water, and 25% water wetter, and yes, it gets far below freezing in the winter time