I've read all the posts and I'm just wondering if anyone has experience with the Super Turbo. I want to repalce the muffler on my 04 F-150 XLT 4.6, and I was thinking Dynomax because of my 2 Jeeps. I have the S-T cat back on a Wrangler and Cherokee and have been happy with the results. Less upshifts in the hills and a 1-2 mpg gain. The best part for me is I notice, but most people don't notice the the sound difference. I would be happy with the same results from the truck since at least 2 shops will install for $120-130 total. Anyone out there who dosn't have a Flowmaster or Magnaflow?