The Bilstein B6 Performance rear damper for the Mitsubishi Lancer Evolution is a yellow monotube gas-pressure shock built as a bolt-in upgrade over stock. The manufacturer describes the B6 as an improved OE replacement built to OEM standards. Its monotube layout places a floating piston between the gas and oil, and on most B6 models the working piston is about 63% larger than a twin-tube's, which the manufacturer ties to sharper, more consistent damping. Because it copies the OE mounting, you can keep your factory spring and still gain control over a stock Evo rear end, a cheaper route than a coilover conversion for daily-driven or lightly tracked cars.
Fitment listings for this part differ on model years, with some matching the 2004-era Evolution VIII and IX and others covering a wider 2003-2006 Lancer range, so verify against your VIN before ordering. The B6 can be fitted rear-only, which suits drivers who want firmer rear damping for added load. Owners on user forums say rear strut removal on these cars usually means disconnecting the sway bar endlink and the lower control arm-to-trailing arm bolt, and a seized lower strut bolt may need a breaker bar. Evo VIII rear shock upgrade, Evo IX monotube rear damper, and 46mm rear monotube shock are the terms enthusiasts typically search when looking for this part.
The manufacturer states the B6 is designed to pair with the factory spring. It recommends the B8 instead if the vehicle is lowered.
Yes. The manufacturer says the B6 can be fitted per axle, including rear only.
The manufacturer says the B6 is built to OE dimensions and installs like the original at stock height, with no modifications required.
Rear shock replacement on these cars is a moderate job that requires a jack and stands, a socket set, and a breaker bar for seized fasteners; a pry bar and mallet may also help. Owners on user forums report that the lower strut bolt can seize inside its bushing, so expect to use leverage rather than an impact alone. Owners also note that the shock body itself is symmetrical, while the spring seat and top hat alignment is what matters for correct orientation. One owner estimated roughly 20-30 minutes per shock, though actual time will depend on rust and seized hardware.
