If you’re going to re-use the stock continentals, I don’t agree with what you say. Their sidewall is rounded compared to other brands like Federal, Yokohama, etc. It’s best to use at least 245 tire width for an 8.5 inch wide rim.
I have it on my hatch using 245/40/18. No problems with grip. Only downside that I have is less gas mileage from the stock continentals which is true since it’s a UHP AS tire.
If it’s your parents car and they’ve given you consent on what parts you can install, then go ahead. Make sure that you just don’t go over the top and make sure it’s still okay with them when they drive it.
A simple drop-in filter and some headlight bulb upgrade (if halogen) with interior LED...
I would definitely avoid that dealership in the future.
I had an incident with Burns Honda at Marlton, NJ where the tech over tightened my lugnuts to 110 lbs. The Costco tech needed to snap one of the studs because it wouldn’t come loose. I already marked the Honda tech who did that to my...
It depends on the brand of the tire since different manufacturers have different side wall shape. But a 255 for a 9.5 will definitely be fine and not be overstretched compared to a 245.