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  1. Battery size

    I've seen various posts on battery size. Does someone know for sure the battery size for a 2019 Si Sedan? I've seen 51R. Others say its too tall.
  2. Illinois Sold: 2019 Si Wheels & Tires

    $500. Good condition, small rash on each wheel as pictured. Goodyear Sport A/S with 7/32 tread. Pick up in Elburn, Illinois.
  3. Car fell off jack

    An ominous creek and then the car slid ( yes the front wheels were chocked). The jack rearranged my trunk. Do you think it's okay to try to hammer it back into shape??
  4. Replace front fake grilles?

    I was thinking about replacing the two, smaller fake honeycomb grilles in the front of my 2019 Si sedan. However, I have a PRL Cobra CAI (street) that I plan on installing in the spring. I'm wondering if replacing the fake grilles with real, open grilles will end up drenching the air filter...
  5. Illinois OEM 2019 Si Sedan Exhaust

    About 24,000 miles. Perfect condition. No issues. Located 40 miles west of Chicago. $100. No shipping.
  6. Invidia R400 Exhaust

    Does anyone know the bolt size and length to connect the flanges of an Invidia R400 exhaust pipes? I am re-installing but do not have the parts kit. Or is there a general spec that will work on most exhaust flanges? Thanks!
  7. Doing your own maintenance

    For those of you doing the entire maintenance of your car, including brakes, etc., what types of tools are you using. In general, I'd like to know if corded and cordless impact tools are up to the task or do I need a full pneumatic setup?
  8. Going from 235/40 to 225/40 tires

    Has anyone gone down to a 225/40R18? I am wondering if the less than 1/2" width difference is noticeable handling wise. I can get a great deal on 225's, but I prefer the look of wider tires in general.
  9. USB Audio Source

    Has anyone noticed the USB audio source playing an album's songs out of order? I searched the forums for info, but have not found anything yet. I'm talking about, when the Audio "Source" is a USB flash drive (32Gb) plugged into the USB port in the center console/arm rest. It seems like the head...
  10. Aftermarket Rear Sway bar setting on Si

    This weekend should bring some downright balmy temps (mid-forties) for the Chicago area (so much for a white Christmas) :( So, I plan to install a Whiteline rear sway bar (22mm solid) and Whiteline adjustable end links on my '19 Si Sedan. First, a shout out and thank you to Mitchel at...
  11. Sold: WTB 3.5" Center channel speaker - JL or other

    Anyone selling an extra 3.5" speaker?
  12. Tweeter Upgrade

    I've seen some discussions on speaker replacement, but nothing definitive on replacing just the tweeters - two front and two rear. I've read their impedance is 3 ohms. Most 1" replacements are 4 ohms. I found some 3/4" at 3 ohms. Will a 4 ohms replacement lose noticeable volume when paired...
  13. What's with the Si sedan's rear spoiler?

    It bothers me the Si sedan's rear spoiler doesn't let air flow underneath. It's solid, all the way to the trunk! Doesn't this affect aerodynamics negatively? Is there an option to replace it with a spoiler that actually lifts above the trunk lid? This one seems like a cheesy, glued-on ornament...
  14. 10th Gen Civic Si Aftermarket Wheel and Tire Options

    Fortunately, or unfortunately, my 2019 Si sedan was mistakenly shipped with the summer tires. Fortunately, because it brought back memories of the up-sized O.Z. rims and summer tire rubber bands I fitted my '94 3000GT with when I still had a full head of hair. Unfortunately, I still live in...


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