EDIT: For quick reference, here's my complete list of changes updated July 15, 2019: Engine: Hondata +9, Mishimoto Intake, Mishimoto Intercooler Kit w/Piping, Mishimoto Catch Can, 27Won Engine Mount, 27won Catted DP + FP, Magnaflow Catback Transmission: Acuity Short Shifter, Acuity Cable Bushings, Acuity Pedal Spacer Bracket, Acuity Shift Boot Collar, Mishimoto Carbon Fiber Shift Knob Chassis + Suspension: K-Tuned K1 Street Coilovers, K-Tuned Rear Camber Kit, Ultra Racing Strut Bar, Ultra Racing Trunk Brace, Type R Subframe Brace Wheels and Tires: Konig Freeform 18x8.5 ET35, Continental ExtremeContact Sport 245/35ZR18, Muteki Steel Lug Nuts Brakes: Front - Brembo 4-Piston Calipers from Hyundai Genesis Coupe, mated to Nissan Rogue with 3rd row seat Rotors (320x28mm), Brembo Pads, Dot4 Fluid, and Goodridge SS Lines. Rear - OE Rotors + Pads, Rear SS Lines Exterior: CeramicPro Ceramic Coating (Silver 5-year Package), 15% Tint all around, Vinyl-wrapped Chrome Window Trim Bayson R Lip, HIC USA Rear Window Visor Interior: Tuxmats All-weather mats Front + Rear, Custom Flat-Bottom All-Leather Steering Wheel, Trunk Sound Deadening Lighting: SK LED's Interior + Trunk + Reverse LED Lights, Custom Side Marker Lights --------------- Hey Folks, I've been on here for about a year and some, always exploring the forum and spending most of my time on this section for obvious reasons Love the community on here, discussions are plentiful and knowledgeable while also being respectful! I might see some familiar faces from my Instagram, AegeanBlueSi as well! Little back story: I have no previous experience with Honda performance models, always thought they were little rice rockets (save 3rd gen TL Type S and NSX). Up until the last moment, I was about to pull the trigger on the Hyundai Elantra Sport but as luck would have it the spec I wanted not being available in Ontario gave me a chance to wander into a Honda dealer near my office, test drive the Si, and sign on spot. What impressed me was the abundance of tech, well laid out interior, roomy feeling, front seat design and comfort, and last but not least the performance and balance of the car! Looks are subjective, as there are still some angles which I am not too fond of on the Si. My first and previous car before this was a 2004 Volvo S60 R. Timeless design, built like a tank, and the 2.5L 5cyl turbo engine makes one of the sweetest sounds in the automotive kingdom! Sold the car to attend university, miss it everyday. A very special and rare beast, but I always found myself worrying about little nicks and knacks which held me from truly driving the car. It was mildly modified, crank numbers of 330hp and 320tq would be a fair estimate. The Si was well within the budget, and with Honda reliability giving me extra assurance I felt that a worry-free new car would be the route to choose over taking on another "project". Time to find out if that would be true...July 6, 2017: Delivery Day! Got into tune with the Si very quickly, I was enjoying the feeling of a nimble and newer car. Weighs 800lbs less than the Volvo so that should come as no surprise. Gas mileage is also a plus as I was averaging low 20mpg's in the R, and mid-high 30mpg's in the Si. However, the Honda still didn't fulfill the smiles per gallon category as it's not too quirky, drama is kept minimum, and well it was stock. Let's change that... October 2017: Got rid of the fishbowl look with 15% Ceramic tint front and rear. The chrome window trim was also wrapped in 3M Gloss Black. November 2017: met a vendor at SEMA that manufactures steering wheels. Coincidentally they had a 10th Gen steering wheel at their booth which immediately drew my attention, and I let them know that I wanted it by the end of the show! This is a full replacement steering wheel with a flat-bottom, re-using all the factory steering wheel controls and airbag. The Hydro-carbon print although not real CF, is as close as one can replicate it to be; amazing detail down to the weave. I've had it on for over 9 months, and it has held up fantastic! Mishimoto CF Shift Knob also added to complete the look! A few other mods installed that night - Mishimoto Catch Can: Acuity Instruments Throttle Pedal Spacer and Cable Bushings (not pictured). I'm using position B for all 3 settings, it's made for easier rev-match, and learning heel-toe much easier! Hondata FlashPro! By far the most noticeable upgrade, the car went from having some power to OK THIS IS QUICK! I've been running the +9 basemap for about 6k miles now, and before that a short stint of +6 for about 1,500 miles. My clutch does not engage any differently, but I can tell it is the limit for what I can push on the stock clutch. I am awaiting a replacement option to be available from Exedy most likely. ... Couple miserably cold winter months pass without any modifications... March 2018: Always disliked the orange side markers, and on my trip to Asia I picked up the Honda OEM clear side markers. LED bulbs to match the LED Headlights (standard on Canadian Si) Interior LED Bulbs at the same time April 2018: Replaced the factory anchors with Konig Ampliform 18x8.5 ET35 - Gloss Brinze Wheels! These weigh 19.5lbs, and immediately the car feels a lot more nimbler. The profile is also perfect I feel for the car so I'm quite happy about the purchase! The car is not lowered in the above pictures but it seems so as I was carrying my winter steelies + tires which added 200lbs of weight. I was able to source H&R Springs through my friend who performs the installs on my Si. The H&R Sport Springs lower the front by 1.25", and 1" at the rear. Note: H&R won't specify that these will fit the Si, but they do and do not throw a code. The reason I went with H&R over other confirmed tested offerings is that H&R's progressive spring rate retains OE levels of ride quality. May 2018: Replaced the factory intake with Mishimoto's Intake. It's hard for me to quantify actual performance gains as I didn't do a before and after dyno, but immediately I am happy that I get to hear the intake breathing as I accelerate even mildy, and the blow-off like sound is a bonus too. When I got the Si I knew I wanted for it to see some track time, improving my own driving skills and having fun at the same time Enter Enkei RPF1 w/Firestone Indy 500's 245/40R17. 17x8 ET45, weighing 15.6lbs each! Gold was not my first choice, but got a ridiculous deal on these so I decided to go with them. June 2018: Registered for my first AutoX day, and it turns out I am not the only 10th Gen Si owner who likes RPF1's... there was three of us! The Indy 500's performed great, they compliment the Si's already nimble and well-tuned chassis. After lowering the car rear alignment could not be adjusted with the factory camber arms. Rear Driver's side had -2.4 degree, and Rear Passenger side had -1.7 degree. Post-install the rears are both -1.8 degrees, and removed the guide pin on the front struts for -1.0 camber. Steering is more lively, only downside is that I have to make frequent adjustments on the highway to keep the car centered in the lane. July 2018: The lack of exhaust sound has always bothered me about the Si. I purchased a used stock exhaust from another owner, re-used only the factory resonator, making the rest a round piping 2.5" system. Past the rear suspension, the exhaust had been painted flat black for a stealthy look. The tips are Vibrant 1333 (2.5" inlet, 3.5" outlet, 7.5" wide, 10" long). I'm not a fan of how there is space left on either side of the tips, but there is little I can do till a full replacement diffuser piece becomes available. -- August 2018: So, let this be a pretty comprehensive start to my journal for my 2017 Honda Civic Si sedan. I will be continually updating as I do more to the car in the coming years. Feel free to comment, and ask any questions. Thanks!