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Shifter Bought in March/April 2025 (two months before the full shifter was announced. No plans on upgrading to Fully Adjustable for another $425 (the spacing is fine, and I don’t need the adjustability, and I don’t want to spend $425 for marginal gains) Stock Shifter was stiff for first 100...

PRL RMM Great, highly recommended, for the first 50 miles, I was worried. I could feel the subframe vibrating, giving me essentially a massage in my seat. But it settled down and now feels great. The stock RMM is very smooth, but gets buzzy above 5,000 rpm. The PRL is slightly buzzy on start...

Cooling (Intercooler & Cool Plate) Removing the bumper to install this was a pain in the ass, but doable. 3-month out of the year kind of mod here in Michigan, but I haven’t heat soaked yet and I drive aggressively. I don’t notice any extra lag on the street with the PRL intercooler and stock...

Oil Dilution: We know 10th gen 1.5T engines suffered from this, especially in northern climates. The simple answer is that certain owners did not drive their cars for long enough to evaporate the gas that collects in the engine oil (naturally due to direct injection). Many short trips (think...

Break-In & Oil Changes: Honda Engineers Have Internal Debates Regarding the Usefulness & Necessity of Break-In Oil Changes https://www.civicxi.com/forum/threads/asked-a-honda-engineer-about-the-factory-fill-and-whether-there-was-any-benefit-to-keeping-it-in-longer.54128/ BMW Official OEM...

Money Post – 2025 Civic Si $31,855 – MSRP $455 – Platinum White Pearl color $1,150 – destination charge $1,929.54 – Michigan 6% sales tax $4,807.96 – Capitalized Interest @ 5.99% $475 – dealer fees 20% down – conservatively financed $34,250.54 OTD I’m the only car guy in the world who doesn’t...

Aesthetics (i.e. customizing my Civic): I like the debadged look. Every car I own, I have ripped those things off and sometimes even the company logo. My Civic is no exception (with exception to the H Badge). I applied the Honda black badge in rear and debadged the “CIVIC” and “Si” badges...

Fuel Economy Normal driving with Michigan 93 is 32mpg, 1mpg above EPA estimates I get 31mpg when I am more aggressive, and 30 mpg when really hammering it +40mpg on 100% highway trips on summer gas I am satisfied with my Civic’s fuel economy.

Why did I buy the Si? I work in finance, and this is my BWM 3 series replacement. No actually, it’s my Audi S3 replacement. I’m supposed to be in those kinds of cars now that I’m in my mid-30’s, but by the looks of it, I’m a decade behind because all I can afford is a Civic Si. I’m a banker...

NEGATIVES: Beyond the things I can change (tuning for some more power, etc.), the worst things are: 1) Android Auto (Google, not Honda). In July or August 2025, Google pushed an Android Auto update that… wasn’t great. I had lots of problems connecting wirelessly, but it seems the issues have...

Review of the Si: Brief history: In January 2024, I put down a $500 deposit on an Si. Literally the next day, Honda Corporate announces the Civic refresh. Damn. I spend the next month going back and forth whether to delay or purchase. I end up cancelling my 2024 Si and waiting a full year. I...

OEM+ “NA” build (In this thread, we don't just build cars but relationships with them, too.) My goal is to put some money into my Si and turn it into “what it should have been from the factory”. But in doing so, I don’t want to fundamentally change its character or power. If I wanted something...

I'm on 18x8.5 +38mm & DWS06+ 245/40R18. 245/40R18 is a very popular upsized tire for the Si. The speedo error is very small and the sidewall is only slightly taller than stock. 245/35R18 is much smaller than 245/40R18 with a thinner sidewall. Plus the tire will look smaller in your wheel well...

Amsoil is 99% efficient at 20 microns. M1 is 99% efficient at 30 micros. Per their websites.

Looks like a wide body Civic hatch 🤷‍♂️

I can't remember sources, but over the years, I've come away with a negative few on catch cans. They are the easiest parts for manufacturers to design and create (can, tubes, brackets), which means they have the highest profit margins. Companies love to push them because of this. The catch...

Lol this 100%. I was at 45psi at all 4 corners. Had to deflated down by a lot.

Yeah, what the camel guy said. Don't sit at one rpm level for too long. Downshift every once in a while and do gentle pulls on the highway. I'd say keep it under 4,000 rpm to 600 miles, then slowly increase rpms and hit red line when you reach 1,000 miles. Don't overthink it, it's a reliable...

I spent $225 for the PRL rigid collars because of the all the good reviews on this site and others. Just like Project DD, I couldn't feel much of a difference on the street, even after an alignment. While I don't regret buying them and the pain in the ass it was to install them, I probably won't...

Thanks, looks really cool, yeah might have to cop one for Christmas. What are its dimensions? Would you please mind measuring for me?