1. Where can I find in channel window vent visors in the US? Has anyone moddified stickons to fit inside?
I think Hekos are the only ones left. Sadly, unlike some CR-Z accessories, their price hasn't collapsed.
2. What changes were made on these cars? Year to year?
Check the thread about it.
3. What fit manifold do I need?
You don't. The Z will not be a screamer, and the Fit manifold might
move the torque curve around a bit, but not really to much benefit.
4. What's the best CA legal intake, exhaust?
Nothing's legal here, grasshopper.
5. Any other low budget mods worth doing?
Perhaps an aftermarket arm rest, if your car doesn't have one. The Honda arm rest is very nice, but way the hell too expensive.
6. Should I be worried about excessive heat getting to the battery? It gets over 110 here in the summer and there a sticker on the door jam that says it needs to stay under 150
Hasn't been an issue. Pretend the car doesn't have a battery, it'll save you lots of worthless panic.
7. Should my battery meter get to all the way full? I've been driving it for 2 weeks and it's got to full bars 2 times for a few minutes. Usually sets at 2 bars below full
Strangely, to me, it seems the only times I see the bars all the way up is on runs up to Tahoe. Watch for the deer.
Any info is appreciated. I did use the search feature but found nothing or conflicting answers
Ah. Welcome to internet forums.