Here's my straight piped system. I had my exhaust done in june with a Dynomax $20 after rebate muffler from Summit. Took it off, ordered my flow, and here's what my system looked like for a few weeks:
The sound was awesomly ratty sounding, like a rat rod. A little annoying under extreme acceleration. It was really quiet at idle, but very loud at any rpm while driving (1500rpm and above.) The system wasn't all the way back, but there was a member here who had his all the way back and liked it. Downside: VERY BIG Loss in power & mileage.