Hello, you won't really find a tuner for $300. I have the MRTuning tune, but others like HD diesel supply, PPEI, SFTtuned, and Im sure there are others. Any of these choice will drastically improve the throttle response, but will also shut off the EGR valve. This is good for the engine but depending on where you live, may not pass emissions. I would recommend going with one of the companies that uses a hand held tuner, so that you can flash back to the oem tune when needed, as well as re-flash your tune in case the dealer decides to "update" your OEM tune and wipes your aftermarket tune.