#GRIPACTIVATED Whiteline rear swaybar and end link install

Front wheel drive cars like our beloved Honda Civics have a tendency to be very understeer bias from the factory.

Now what is understeer you ask?

Understeer or “push” as you may hear it referred to in the racing world is a condition when the front tires lose traction before the rear tires. When approaching a turn if we lose traction in the front tires the car will take a much wider radius to attempt to make our turn or in some severe cases just go straight and not turn at all. So from the driver stand point it would break down like this. You would enter the corner perhaps too fast, rotate the steering wheel in the direction you intend to make your turn and despite all your best efforts the car does not go in the direction of the turn but rather much wider or simply straight ahead and not in the direction you want to go.

Having already taken our 2018 Honda SI out on track after only owning it less than 500 miles we only confirmed what we already knew. While a great car out of the box the Civic still wants to understeer and could most certainly use some help in this department.

Front Facing at The Track .jpg

It was right after this track day that we reached out to our friends over at Whiteline Performance to see if they can help lend us a hand and see if we can activate some more grip under our ride.

After some emails and a phone call to discuss our goals and what we wanted out of the car the guys over at Whiteline had just the solution we needed and sent us over there full Sway Bar vehicle kit for the 10th gen Civic.


Manufacture: Whiteline Performance

Part #: BHK017 (full kit)

Components: Front and rear sway bar, front and rear adjustable endlinks, front and rear sway bar bushings


  • 27mm solid 2 point adjustable front stabilizer bar and a 22mm solid 2 point adjustable rear stabilizer bar.

  • Stiffer poly urethane F&R sway bar bushings

  • Fully adjustable front and rear end links

Whiteline rear sway bar on 27WON honda civic si.jpg
end links.jpg

Once we received the kit we had a very unique strategy that we opted to employ. Despite getting bars for both the front and rear we opted to only replace the rear bar first and see how the car performs. We did this in an effort to combat the under steer problem specifically. Note that when a car has understeer characteristics there are a few things that one can do to mitigate this. One of those things is putting a larger rear bar in the car in an effort to increase spring rates and get the car to rotate more.

Rear End, On Road.jpg

Immediately after the install we noticed a very dramatic improvement in the ride handling characteristics of the car. The SI wanted to rotate much more in corners and did so in a controllable manner. We opted to put our bar on the stiffest setting to really get the car to turn in and help get rid of some of our push (understeer). All in all it did a great job and an upgraded rear sway bar is great bang for buck mod on the suspension and is super easy to install. Will roll on this set-up for a while and then decide if we wish to try out the front bar for our car.


The rear endlinks are a bit undersized for the hole that they go through on the bar. We find that if you over torque the nut on the endlink as we see most do you can actually press into the bar a bit. When this happens you lose a flat surface to sit against and the stud of the endlink can move around a bit and the nut will work itself loose. We suggest putting an m10 washer on both sides of the bar to torque down against that to keep everything together. This will help make sure that you don’t find yourself chasing down a super annoying rear end clunk in the future.