Square exhaust tubing is NOT better than round.

[xveganxcowboyx]

Ever get a look at the turbo Saturn Sky's? I just remembered looking at one recently and being appalled at the intercooler piping. Where it goes over the front bracing the hard pipes squish down to about half thickness! I can't imagine the flow restriction. It's an argument against the "if it was any good manufacturers would be doing it" argument.