I ran a few Z06's and C6's, but you mentioned its an 09 so it's an LS3. For a 600 Rwhp and your mods , you will need the 3.55 gears trust me, I've seen the difference.
The 75hp NOS kit would be a plus but go for the gears and see the difference, if its a roll on the highway try to get him from...
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