What kind of decent all season tires can I buy and use on my stock wheels? What kind of coilovers can I get to slam the car and still keep a quality ride? Where can I buy a rear diffuser that can fit this model? Has anybody straight piped their G, should I go for it?

 

Continental DWS get good reviews as do the Michelin Pilot A/S, both should be available in the OEM sizes. NO Coilovers will have a decent ride when they're slammed. Eliminating the cats, resonated mid pipes, and mufflers will bring a lot of rasp, drone, and generally sound like crap. just a muffler delete will be a better option. Ksport coilovers should be a good choice for the AWD X, but will be a harsh ride at slammed height.