Thanks will check on the drop, looking for a minimal drop since im on 20x9.5+39 275/30r20 tires front and 20x10.5 +39 295/30r20rear.Thinking it might rub if its too low.

 

Hey Mike, RSR are no good at least, for RCFs. They are known to not have enough spring rates for a heavy car like RCF and result in blown shocks. Several members with RSR have experienced blown shocks and there were threads on them. One of my fellow RCF owners RCF with RSRs bottoms out in the rear over the same bump where my car goes over with a thump on OEM suspension and without sinking even a bit (both of us have added weight of TVD on the rear axle ).

@gotnojv Coil overs are ideal option for the RCF and if one must do lowering springs then only one unanimously proven springs on RCF are Swift Spec Rs that have really good spring rates. 9 kg/mm in the front and 16 kg/mm in the rear with a 1 inch height drop (you are looking for minimal height drop so this should work).

 

RS-R Down:
Spring Rate - Front: 8.67 kg/mm Rear: 14.4 kg/mm
(2015-2019) Drop - Front -1.2in to -1.4in Rear: -0.8in to -1.0in
(2020-2025) Drop: Front: -1.0 in to -1.2 Rear: -0.6 in to -0.8 in

Swift Springs:
Spring Rate – Front: 9.0 kgf/mm | Rear: 16.0 kgf/mm
Drop – Front: -1.3 in | Rear: -1.0 in


Speaking from experience on my 2020 RC F, I've had the RS-R Down on my car for over 3 years now with no issues. I’m running them with 20" BBS wheels and Michelin PS4S. The difference between the two spring brands are very little.