Cheap:
Replace cats w/ strait pipe and remove resonator. -- LOUD and resonated like a ****... but costs like 10$
Kinda cheap:
Replace cats w/ strait pipe and install dynomax bullit mufflers --Louder than stock but sounds goooood....
Moderate cost:
Replace cats w/ HF's and use dynomax mufflers --Quieter than #2 but louder than stock
Higher cost
Headers, HFs and dynomax --Good sound, improved HP, but not cheap
Highest cost:
Headers, aftermarket 3" SS exhaust, autoform side sills --Looks great painted body color, and flows the best. Little resonence and a good sound, but expensive.
I went with #2, but I have rear exit so that helps some... total cost ~90$ (mufflers ~35$ x2)
MM