the muffler on my powerstroke is a donaldson... I have 4" mandrel bent exhaust from the turbo back... the truck is barely louder than stock with a great performance tone and the muffler I got flows 99% of what a straight pipe flows which is about 250% of what the stock exhaust flows... it was a bit pricey but well worth it.... It's not loud enough to piss of my neighbors but people tell me all the time that it sounds really mean.
as for duals straight out the back, I've always heard that refered to as sweethearts.... Personally I wouldn't waste any money on big names... NONE of them will do anything for performance. just go to a local muffler shop. Have them whack off the offending side exit tail pipes and bend up some that exit where you want.
As for a muffler... you have to decide what you want it to sound like.... loud quiet mellow or rowdy.... heck I dunno, maybe you want a thrush glass pack for that badah badah badah coolguy rumble :D
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