I found the LS6 intake for around 450.00, nearly the same spec and much cheaper. The issue was the clearance in the front of the motor, I think a tensioner pully is in the way but there is a mod for it. There is a big old post at performancetrucks about it, and every experts opinion. Good info but confusing. I decided to get enough info to be dangerous and let the tuner / builder and the shop here review and suggest once I type "A" it to death.
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