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Yep, the intake manifold won't do much for ya. I got a tune from dynosteve and have had zero issues. Seriously can't go wrong with dynosteve/RDP. I also have the texas speed headers and I did a write up on how to install them I can link you to. They are really well made. I have the LS3 but I hear that a tune on the l99 will wake it up a lot.
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