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My tuner told me that horsepower gains with 1-3/4" headers were very modest. I took his recommendation and added American Racing 1-7/8" headers, high flow cats, and x-pipe (I've got NPP also). The before/after Dyno showed just 22 HP with those additions.
If you're looking for HP, I'd wait and get a set of 1-7/8". For the sound, 1-3/4" should be fine.
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Clear Bra, Tint, Splash Guards, Ceramic Coating, Painted Spoiler and Rear Views
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