I 100% noticed. The real test was a bridge I occasionally go over. Even in Comfort mode with the FL5 ADS, I would bounce like crazy. With the ITS ADS, no bounce. I initially thought something was wrong with my FL5's suspension because of how bouncy it was. My FK8 was very different. I guess...
Amazon or companies that specialize in detailing. I think I may have got mine from Detailed Image when they had a sale. Don't forget the brush. There are specific upholstery brushes.
I concur. I too have both a FL5 and GRC. The GRC is a hoot to drive. Much more mechanical feeling. Reminds me of my old STIs. It has a very different feel than the FL5, which is good because I still appreciate how amazing the FL5 is anytime I drive it. The cargo space is terrible. I ended up...