ok, not a ls truck but still need some opinions on what style magnaflow i should put on my wifes trailblazer. single in single out or single in dual out. it is the I6.

basically from what i can see is it has a huge *** muffler and a resonator. i want both gone and a muffler dumped. i don't want it too loud for normal driving but under heavy throttle it can be loud.

i just don't know what size case and that to get. anyone have any suggestions or ideas on it.