I helped test it and ran it on my car for a bit, along with the exhaust. No issues. I think right now the PRL intake is cheaper because they have a Black Friday deal going on, so I would get whatever is cheaper.
Can’t say how hard it is to remove the rear shocks. I have an si and my installer just had to remove a 17mm and 19mm bolt, pull the rear spring out and slap the new one in without having to trim the bump stop. My guess is you have to go into the trunk, remove some of the carpet covering the rear...
Spring rate on the Swift's are probably going to be higher as usual. Eibach will be softer if you prefer are more tame ride OEM+ like ride. Regardless, the thing making the FL5 too harsh, even on comfort, is the dampening, not the actual spring itself. Big reason why a lot of people are buying...