Not sure on the suspension portion, as I've never looked into it....but that may run you in the $1000's, and you might want to put that towards the Camaro instead.
I do want to recommend a K&N air filter 1000%. The thing boosted my mileage ~3mpg when I drive "normally" (which isn't babying it, I assure you). I went from 29.5-30.5 mostly highway to 33-34 mostly highway. It was roughly double the cost of a normal air filter, but I'll never need to replace it again...just clean and maintain it.
For a daily driver, I feel the mpg, and replacement benefits alone are worth investigating. Check it out.
