Just run straight headers if you want it to be really loud.
Any thing can be loud and obnoxious. Why do you want it to be really loud? Don't just shoot for a loud sounding exhaust. Go for performance as well as a real good sound. Not just to be loud and heard. BTW, even then your side exit exhaust will not be as loud as dumping it off in front of the rear axle. Unless you can fabricate an off-road short h-pipe that branches to the side like straight pipes or something. And even then you will LOSE performance with that set up. Do some research. There's more to an exhaust than just sound. And a high performance exhaust will be plenty loud enough and get you lots of attention. Look at Bassani, Borla, Magnaflow, Dynomax, Flowmaster, and MAC just to name a few good ones.
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1994 Red SVT Lightning #2019