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I've been running w/ out mufflers for the last 2 weeks and it's great. There is a little rattling from the axle pipes on bumps and when cold though. I've talked to a friend at a shop that welds and he's going to cut just the cans off and straight-pipe the stock pipes for $50.
Doesn't a N/A engine need a certain amount of back pressure to operate at peek efficiency? I suspect if you were just running some pipe to the back without the mufflers, it would probably be fine. However, if you removed the muffler and did not have some sort of dump pipe funneling the HOT exhaust down and away from the car, you might well melt or burn something. Someone who know more than me might know.