I am about to do twins and want to go to a 5 inch 304 stainless exhaust and am not having good luck doing the internet search method. I talked to Bully Dog yesterday about their 6 inch radid flow, then they told me it was available in aluminized only. 6 inch is probably overkill anyways, but I haven't found 304 5 inch from Silverline, MBRP, or Diamond Eye. Are the 5 inch 304 exhausts just not listed on their sites or are they not available? Thanks, Jason...