Thanks bored nord . Love the input. I've strayed from the cold air intake because I've heard of them getting soaked with water from the road and such. If I ended up going 3" on the exhaust that would mean changing my headers because they come to a 2.5" collector. How much do you really think I would gain from a 3" exhaust and a cai?
Ya I think I'll be doing both of those things soon enough. Cai and 3" exhaust. What do you think of the skunk 2 cai?
Water ingestion could possibly be a problem, yes... However, that's why any cold air intake I'll be running will have a bypass valve for this just in case situations. I've run the Hybrid Racing cold air intake for over a year here in Washington state, one of the wetter places in the U.S. and even going through dicey puddles, I haven't had an issue.
1320 doesn't have an adapter for a 3" exhaust? Seems a little strange to me... Some exhaust may have a 3" adapter with them, just be sure to read the descriptions.
I think going from a tuned 2.5", to a tuned 3" will net you anywhere between 5-10 horsepower. More if you build the support mods, less with less mods. The K series motors flow a TON of air, so breathing modifications are very effective. Their cylinder head design is top notch as far as flow, so take advantage with it by letting the engine exhale freely.
Financially worth going from 2.5" to 3"? That's up to you. Knowing I could sell the 2.5 on my car would make buying the 3 less painful, but that's just my point of view and situation speaking.