That's ideal for sure. The stock headers on the s65 are pretty much perfect. Keep in mind though that it still uses a XPC so it might not be plausible with the FPC exhaust configuration
Same concept as ABS which has made its way into every car on the street. You can brake more quickly and effectively without the system, but very few average drivers today would know what to do if they didn't have the system in place.
It's the same thingg If I'm not mistaken. Remote(adjective) is being used in the context of being located somewhere remote on your person as opposed to being a "remote"(noun).
Riverside County is 8% as is most of CA. Some cities actually levy an additional tax. Here in Palm Springs it's actually 9%.
https://maps.gis.ca.gov/boe/TaxRates/