Installation was relatively painless. Picture below of the front coilover compared to the Nismo S-Tune shock. Weight for both were surprisingly the same give or take a couple hundred grammes.
Picture of the installed front. Rears are 1 kilo lighter than the Nismo S-Tune (4kg vs 5kg).
Picture of the rears compared to the Nismo S-Tune.
The front damping adjustment knob.
Took quite a while to find the rear damper turret top as it is in a place where the sun don't shine. At one point had nearly all the carpeting and seats removed to locate the turret top. Once done it was a synch to bolt the damping adjustment extenders to the coilover damping adjuster knob.
Had to make slot holes in the carpet trim to be able to reach the damping adjustment extender knob without having to remove the carpeting.
Ride height can be adjusted without removing the front wheels but you will have to remove the rears (to adjust ride height). I settled for a 645mm front ride height while rear was set at 640mm after alignment. This is about 1.5-2cm lower than stock with 17" rims with 215-45 series tyres. Picture of the Slowtra with this ride height. Will go lower for track days but going lower for daily driving is just looking for trouble unless you don't do multi-story car parks nor have an abundance of speed bumps at your work place.
Damping was initially set at 6 clicks from full soft and then 5 as the damping settled. I also tried 7 and 8 clicks and while the Slowtra handled better my old butt preferred 5 clicks for daily driving especially with the abundance of pot holes in Penang and mainland roads. At 5 clicks I would say the BC Racing BR is feels about 15% stiffer compared to the Nismo S-Tune. Haven't tried full soft but wouldn't be surprised if it ends up feeling softer compared to the S-Tune. With the stiffer springs I am having going full soft might not dampen the spring sufficiently during high speed though I have yet to try. I would say the BC racing BR does very well in terms of vibration and harshness. Even at 5 clicks there is very little dive during hard braking compared to the Nismo S-Tune. Body roll is minimized. Damping is very controlled with little hint of harsheness despite much stiffer springs. The rebound action is pretty quick and the car doesn't bounce around when riding over road undulation/uneveness. Corner turn-in is faster and the Slowtra's agility is really transformed.
Noise unfortunately is problem due to the abundance of metal to metal contact especially with spherical bearing top mounts. The rears in particular is prone to squeaking especially if the coilover is not kept clean. I am also getting something akin to a scrape sound when going over steep speed bumps from the front right (driver's) side. A call to Daniel from BC Racing Malaysia on this problem came with the recommendation that I should use Autosol on the piston rod. Errr.. The sound does not seem to impact damping hence at this point I'm still observing for further if there are other issues.
I would recommend the BC Racing BR RH series if you are primarily concerned with handling but have no grouch with noise. There is always the ICE to help :) The external build quality is as good as it gets (even better than the Nismo S-Tune) and likewise the damping with little evidence of low speed harshness compared with lets say early gen Hot Bits coilovers I was using once upon a time on my first car. One can feel the difference even with one click change in damping adjustment. The only problem is the noise though going to rubber top mounts would lessen it. Just don't expect stock like no sound. Can't have your icing and cherry to go with the cake.