Yes, my Mountune sprung Fiesta ST is stiffer than the RS, except for in Track Mode. My ST with FSWerks exhaust is also louder than the RS, but lacks the pops. I do like the pops.
Chad drove my Fiesta ST and agreed it is stiffer and louder than the RS. On the inside, the RS is very quiet compared to my ST. On the outside in Sport mode, the RS and ST are similar. In normal mode, the RS is much quieter on the outside than the ST. Normal mode actually sucks to be honest. Sport and above is much better.
Chad drove my Fiesta ST and agreed it is stiffer and louder than the RS. On the inside, the RS is very quiet compared to my ST. On the outside in Sport mode, the RS and ST are similar. In normal mode, the RS is much quieter on the outside than the ST. Normal mode actually sucks to be honest. Sport and above is much better.