slight
You will see some change, but it wont be full potential of changing the headers as well. The entire system is the breathability. Even if you change the cats and exhaust, the exhale of your engine is still restricted with the stock headers. You will see and feel a difference Im sure, but still not the complete difference until you open all restrictions in the exhaust side.
I feel you on the wife thing, I hear about it everyday. She is used to me spending rediculous amounts for the Japanese market products, vice what can be purchased here in the U.S. My trick is just to take her shopping so she can spend a couple hundred here and there.......and she will leave me alone for a mod or two.
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1996 Skyline GT-R LM fully tuned by Mines/2006 Nissan Titan 5.6 SE Texas Edition/2009 370 Base w Sport Pkg 
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