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RunCool hood louvers stick on with bonding tape. This is going to help my engine better handle summer track sessions. It could be my imagination, but in local driving the coolant temp gauge sits a little lower. When I park I can certainly feel hot air flowing out of the vents. Maybe they should...

Hasport motor mounts that failed https://www.civicx.com/forum/threads/melted-hasport-motor-mount-bushings.81779/#post-1229056 have been replaced. The car is faster on the track! The theory is that the vibration at high revs was causing the knock sensors to cut back power. The only power mod is...

My 2018 Si has Hasport motor mounts. They had U70A bushings. When replacing them with U62A, for less vibration, the old ones appeared melted. Not doing their job in any case. Needed to be replaced. It looks like it gets too hot under the hood. I'm thinking of hood vents. Sometimes I don't bother...

Replacing rotors this weekend, using old hats. What should the rotor hat bolts be torqued to? Can anyone answer this weekend? 6mm bolts with blue locktite.

Set of 2018 Si OEM 18" wheels with Bridgestone Potenza S-04 tires. Some curb rash. Well-used tires. In Rhode Island. Pickup. $500.

Replaces Civic dashboard center speaker. A definite improvement. Sold in pairs, but only one is needed. So I have one in original box, with Honda connector adapter. Easy to install. $65 including US shipping.

He said, "I should get me a Civic." sounding kind of surprised. Other cars in the group were McLarin, Mustang, Camaro, BMW, Miata, Porsche. He was an instructor in an afternoon of advanced driver coaching, consisting of autocross lapping all afternoon, sometimes with an instructor in the car...

In the winter I installed the HFP Sport Suspension, for better performance on track days and autocross. I am very happy with it. I didn't want the car any lower, as it is my only car, for all purposes, on all kinds of roads. I wanted to preserve the adjustability with the Sport button. I was...

Sometimes, not often, when I start the car and push the e-brake button, I get brake, abs, traction control, hill hold, and so on, warnings on the dashboard. I put the e-brake on, stop and restart the engine, warnings show until I turn the e-brake off again. Then car seems to realize it is ok. No...

Having installed the Honda Si High Performance Suspension Kit, I am selling the suspension parts I removed, all springs and struts, and controller. Suspension had 29K miles. $200 plus shipping (about $100)

Battery died. Is charging now. Owner's manual says immobilizer reset is required. Manual says to insert the key in the ignition. What is the procedure in our case with only the remote and start button?

Called a Rhode Island Honda dealer to get a price on the HFP Sport Suspension. They told me it doesn't exist for the 2018 Si. I gave them a part number I got from the College Hills Honda Website, Part # 08W60-TBF-101, they said that is for the 2019-2020 Si, but it doesn't fit the 2018. I asked...

Following instructions, I have been disconnecting the battery negative terminal when doing some work on the Civic Si. Then when I reconnect it, I am surprised by the power of the spark. What is drawing all that current when the car is turned off? Is there something that can be done to prevent...

2 Sets. $100 plus shipping HB875B.666 I installed aftermarket calipers and can't use these.

This car is really good as both. Or was until I replaced the motor mounts. Now it is winter, and there is no track fun for a while, it is hard to accept the awful rattles and buzzes caused by the Hasport extreme performance motor mounts I had installed after the originals were destroyed by a...

Does anyone make a better top front motor mount for the Si? I totally destroyed the rubber one on the top right of the engine on a bumpy track day on an old airport yesterday. It is going to happen again if I put in another OE one

I have just installed the 27Won Big Brake Kit on a 2018 Civic Si with the OEM wheels. It required 5mm wheel spacers. There is 1 to 2 mm brake clearance with the spacers. As a result the lug nuts only engage 4 full turns instead of 7 or 8. This is not acceptable to me, especially for track and...

Started autocrossing my Si with TSP Stage 1 tune, max boost mode., Bridgestone S04 pole position tires. At full throttle, in 1st or 2nd there is a momentary pulsing, lasting a second or two, like the opposite of ABS action, but slower in frequency. Traction control is off with light and blinking...