Duct Tape Civic Grill Blockers are Awesome (in the winter)!
I removed my lower grill block with the warmer weather. The upper grill block is still in place. For a while, it seemed like spring would never come here in NJ.
What Ecky said ... if you have a smartphone, get an OBD dongle and a good app or two.
There's a bunch of stuff in my Ain't Fuelin playlist that you might enjoy (OBD stuff, grill blocks, etc ... my first project car is a '99 HX):
https://youtu.be/54mIEWdUesA?list=PL...R754kIg_V8Aahm
Not sure what kind of bump you might see with the HX wheels. What tire will you be using? I'm happily running OEM size (185/65-14) with Michelin Defenders.