I have had my 07 mustang for a couple of months now and I think it is ready to be upgraded. I was thinking either cold air intake, Hurst shifter, or American thunder mufflers (all with or without a tuner- not sure yet). I figure there would be a lot of helpful advice here. Please let me know your thought and if possible include which brand to go with (ie. K&N JLT BBK ect). Thanks I look forward to responses!