thats fine man....that thing needs at least a gallon of fuel through it before it is really broken in. 220 is at the low end of perfect temps range but still fine for break in.....the stock exhaust is horrible,,,and because of its design I believe the unburnt fuel and excess oil sits in the bottom of the stock pipe rather that being blown out during the exhaust stroke,,,so when you tip the truck it runs out.......once the THS pipe is on it will really wake up and you can lean it out to run 250 or so consistantly. I would suggest a better header as well,,,I've had great luck with the OS header.