Hasport Motor Mount Kit for 02-06 RSX / 02-05 Civic Si

Hasport Motor Mount Kit for 02-06 RSX / 02-05 Civic Si

Twenty years in, the factory rubber mounts in a DC5 RSX or an EP3 Civic Si are finished. You feel it as a shudder when you get on the throttle in second, a clunk when you lift, and wheel hop that eats the first sixty feet of every pull. The Hasport DC5STK mount kit replaces the three mounts that actually control that motion, and it does it without moving your K20 out of its factory location.

What It Is and Why It Works

This is a stock replacement kit, not a swap kit. Hasport keeps the engine in its factory placement, so your axles, shift cables, header, and intake all go back exactly where they were. What changes is how much the engine is allowed to move. Billet aluminum mounts with polyurethane bushings take the place of collapsed factory rubber in the left, right, and rear positions. On a K20A2 or K20Z1 Type-S, the rear mount is where most of the improvement lives. It takes the torque reaction in first and second gear, and it is almost always the one that has turned to mush by the time the car has 150,000 miles on it.

There is no front mount in the box, and that is deliberate. Hasport does not include a front mount in these kits because the left, right, and rear mounts hold the engine and transmission far more firmly than stock, so the front mount stops doing meaningful work. Leave your factory front mount in place. If it is torn, replace it with an OEM part while everything is loose, because you will never have easier access to it.

What you get out of it is traction and feel. Less wheel hop off the line, less driveline slop between throttle inputs, and a shifter that stays put under load. On an EP3 Civic Si, where the shift linkage runs across the top of the transmission, killing engine roll does more for shift quality than most people expect from a set of mounts.

Specs

Available Options

Fitment

Manual transmission chassis only. If your RSX left the factory as an automatic and you are converting it to a manual, Hasport builds a different kit for that chassis (DC5AMC), and this one will not work. The DC5STK version sold here is matched to the RSX and 02-11 Civic Si manual transmission. If you have swapped in an 03-07 Accord or 04-08 TSX transmission, or a 12-15 Civic Si transmission, Hasport builds DC5STK-4 and DC5STK-5 for those cases. Call before you order if your drivetrain is not the one the car came with.

What to Know Before You Buy

Start with the durometer, because it is the decision people get wrong. Hasport rates this line to cover everything from a daily driver to an 8 second drag car, and that spread is real. 62A is the street bushing and the one that goes on most RSX and Civic Si builds we see: firmer than factory rubber, clearly tighter under power, and easy to live with on a car you drive to work. 70A is a race bushing no matter how often it gets sold as a street part. Expect a buzz through the floor and the shifter at idle, more noise on engine braking, and interior trim that finds new ways to rattle. 88A and 94A belong in cars that see a track or a strip and have already given up on comfort. The 6061 solid option deletes the urethane entirely and passes everything the engine does straight into the chassis.

Be honest about the trade. Polyurethane does not make a car quieter. Every step up in durometer buys engine control by spending cabin comfort, and there is no version of this kit that rides smoother than the rubber Honda installed. If your only complaint is one torn mount on an otherwise stock car, an OEM replacement is the simpler answer. This kit is for people who want the engine held still.

Two more things worth knowing. Hasport also sells a steel version of this kit under the HP-DC5STK part number, so if you are cross shopping listings, make sure you are comparing the billet kit to the billet kit. And plan for a little wrestling on install: the passenger side bracket is a tight fit on some cars, so hang everything loosely, get all the hardware started, then bring the engine down onto the mounts and torque them with the weight settled. While you are in there, look at the front mount, the shifter cable bushings, and the axle boots, because they are all easier to reach right now than they will ever be again.