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The real decision you have to make is if you're ready to void your warranty. So far, you could go back to stock no problem but if you add long-tube headers, you will more than likely want to get the car tuned to make full advantage of them and make the check engine light go away (it will throw codes).
So you may want to factor in the price of a tune to go along with those headers if you decide to go that route.
IMHO improving airflow through the engine via CAI, ported TB, headers, high-flow cats, axle back and a custom tune is a pretty good bang for your buck.
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2012 - Present: 2011 CTS-V Sedan, A6, Airaid, Zmax TB and Tune by R.P.M. = 535 hp/503 lb-ft.
2009 - 2012: 2010 2SS RS IBM M6, MGW Shifter, BMR Trailing Arms/Tunnel Brace, Roto-Fab CAI, VMAX Ported TB, Kooks 6511-Complete (Headers, X-Pipe, Mufflers), dyno tuned by R.P.M. = 415 hp/412 lb-ft.
"Not giving a f*^k is truly the greatest luxury, and no luxury car gives fewer f*^k's than a CTS-V." - Matt Hardigree |