I have Doug's on my Barracuda. You can hear the "ticking" sound that mopars make with the Doug's headers. I was told the ticking sound is not an exhaust leak, but a byproduct of the firing order. That same person told me you won't hear that when using the TTI's. He told me Doug's are cheap headers and the TTI's are better. He runs a Mopar shop here in CO and has been in business for 30 years or so.