Cops think so too Just put the new Copper Collector gaskets on my Burb. I forgot what it was suppossed to sound like! Sounds SO much better than that stupid open header noise I've been driving with for the past week. Fixed my throttle too so shes nice and smooth now. Sure some things sound great dumping out of headers to nothing(like my dads race motor) but yeah a mild 350 is so much better through Flowmasters.