I dont want to be a party pooper but i feel lowering springs are a bad addition to the vibe. This is just my opinion and some other vibe owners may be happy with their suspension upgrades. Its just in my experience i had two broken front TRD springs after a few years of using them on my 2009 vibe. It was riding like junk so the stock springs went back on.
There are many who've been on lowering springs for 100k+ miles. I've had them for probably 40k miles with zero issues. The bigger concern is using quality struts when lowering.
Also, cold air intake isnt any good becuase the filter can get wet in rain. I know from experience becuase ive wasted money on frivolous thimgs for the vibe in the past.
Typical rain storms will not cause the filter to get wet. Now, if you're fording things or traversing through big puddles, then yeah, it's a possibility.
A short ram intake is usually a better option, just for ease of maintaining the filter. With a CAI, you have to remove the headlight and better to get to the air filter since it drops it down behind the fog light. With a SRI, it essentially sits were the OEM box sat, so it's just in the engine bay.
But really, unless OP boosts the car, all the mods readily available would provide a nominal gain. Most do such mods just for aesthetics.