Have a week drive on Civic FD1 and Proton Persona after your installation.
Full set VS and 3 GC for my 4 year old Civic FD1.
Very noticeable affect. Smoother acceleration and gear change, reduced engine noise. Lower end pickup seems to improve noticeably as initial pre-install pickup of my 1.8 is a bit underpowered and laggy. Laggy no more, no need to tekan kuat kuat to pickup tho definitely not adding torque coz still underpower (can't change that unless I change engine). Extremely satisfied with it.
The full set VS and 4 cable GC on my 1.5 years old Persona H-Line (auto) has lesser effect. Gear change smoothen and lower end pickup improve as well tho not as noticeable as the FD. Probably since its newer than Civic and the stock GC of PE is generally in better condition than FD thus not as noticeable effect. Oh...it also has a noticeable easier cold crank starting the ride.
Full set VS and 4 GC cables on my 7 year old City with pre-installed hard brake low RPM vibration issue has improved. Frequency of low RPM vibration when hard braking is substantially reduced tho not eliminated (it might have some other cause). However as of now, the engine vibrate so hard until almost died did not appear after installation. Not sure of other improvement since I'm not driving it.
A GC set on my another 7 year old City with existing 3 year old Brisk VS....status unknown coz my wife driving it....she will only notice something goes wrong when it totally break down. Probably will only notice I add something in if I put in a NOS and her car goes into longkang when accelerating..
Thanks bro, remember to contact me if you have any question relate or not related to me, but most importantly something about car electrical are welcome.