Magnaflow opinion, Opinions anyone? Options

[LeonStryfe]

http://cgi.ebay.com/ebaymotors/MagnaFlow-M...21874QQtcZphoto

Will the first be louder than

http://cgi.ebay.com/ebaymotors/MagnaFlow-M...sspagenameZWDVW

Which is better, have more growl, and which will be louder out of the two?

Thanks for your input

[LeonStryfe]

Any difference between a double wall oval versus a single wall Round muffler? How would they sound on a stock exhaust? Temporarily, I'm looking for a muffler that would give that aggressive sound on a stock exhaust. I guess I want it to be "semi" loud, enough to let out a growl and be heard by a car next to you, but not too obnoxious that it sets off alarms or sounds like a rattling can like some civics that I've heard. (no offense on civic lovers)

Any recommendation on which "muffler" I should get on a temporary stock exhaust. So far the Magnaflow 14851 seems nice. Any others that maybe better than it?

Thanks for all the inputs guys, I'm just confused regarding which one I should pick up.