i would expect the welds to not be that good for that price and other people i know have bought cheap ebay exhausts and my mates 200sx is un bearable on the motorway at 70mph lol
my yaris was deadly loud at 70, but nearly silent at just over 70? go figure.
it had a flipping loud hks box, only a 3 inch tailpipe
and if its too loud, sound deaden the boot, that helps loads