You forgot a reprogrammed PCM to take advantage of all your mods
i think 2.5 is a little big for a near stock cars exhaust....you may want to say, light bolt on's is 2.25 tops, 2.5 for heavier mods. i know lots of other much more powerful cars recommend 2.5", and where talking 300+hp. what you need is maximum velocity and scavanging effect (smaller pipe helps with this) and minimum backpressure (free'er flowing muffler)
nice list