I have a stock 2008 GXP. What suggestions do you all have for new mufflers that will give it more of an aggressive sound? I know there have been various threads on this topic, but I am just looking for a straight forward answer. Something simple that I can have done quick and a muffler shop. Flowmaster? Magnaflow? Other? What model and size? I have been on youtube and played a bit on there, but that only confused me more. So many choices. Also, thought on air intakes? Thanks.