Not the best way to gain 170 HP for a 2007 C6 but this is what a owner paid out to ge these gains

A stage xx package from a vendor ( most of these parts are really from what was sold for C5s

FAST intake, CAM, ported heads, headers, Catback, injectors, Vararam - owner paid $5,500

Owner paid another $3200 to have a dealer install the parts.

We custom tuned cost $425 and made 50 HP out of that 170 HP gain so the parts themselves a gain of 120 HP which then a cost of $53 per 1 HP gain

Here is the results :