Now for some reason I love the G35 and/or FX45 sound, it's unique. And for the "affordable" part, and keeping somewhat on-topic for this forum, the Ecotec does have a nice smooth refined sound to it. Even the Twin-Cam can sound nice if you put the right exhaust on it (Like Oldsman's). Then again, more totally subjective stuff here.
On another note, I picked up a new muffler for the Alero, for some reason I don't think the pace car muffler is going to last all that much longer (cheap construction), It wasn't really designed for every day use anyways.
http://cgi.ebay.com/ebaymotors/C5-Corvette...sspagenameZWDVW