I have been seeing advertisements for the Injen Turbo-Back exhaust. Has anyone installed on of these yet?

 

Yes, and it's awesome. I have all 3 pieces (cat-back, test pipe, and downpipe). Tons more top end power, quiet during daily driving, really screams once past 4K rpm, comes with an extended O2 bung for no CEL, and at $800 for all 3 pieces it's a steal. I love this exhaust I couldn't be happier. And at the track, my car now shoots 3-4 foot flames lol.