I've been real happy with my TOGs on my Impala. I was talked into them instead of SLPs, mainly due to the ticking issue. It's also nice to see that a year later, the TOGs still have a nice sheen on them. Ceramic coated, yes, but still. It's one of the cleaner things in my engine bay. TOGs don't take a "standard" downpipe. I got mine from 3800perforance and got the DP from them as well. 2.5" diameter; I didn't need the 3" because my catback is 2.5".