Would like to get some more oomph from my 318

jrc4y4 said

I plan on putting in an 8.25 with 3.55 gears as I drive it on the street 99% of the time but want some more launch as it falls on its face currently

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I would do this first, before moving any further. That gear change will make a huge difference.

Headers might give you a bit more, TTI's or Dougs fit better than the rest, but dig into the wallet a bit more. Watch Autozone when they have them on sale, get Summit to price match and you get free shipping.