You can do some LTs, but you would have to get a custom Y-pipe and cats built for it. You could do some high flow Magnaflow cats in the y-pipe, plus a Magnaflow muffler into duals... Prolly the best setup for what you want to do...
Thanks for the inputs, but I already have enough vehicles that I have to de-modify every 2 years for CA SMOG tests. I know long tubes are probably my best bet, but those will have to wait until after I move out of Kalifornia.