Hello

I have a 60RS Ti on my DC2R and could not recommend it enough.
It may sound different on your DC5R but mine sounds great, lovely hollow, racey type noise that is very unique.
Nice an vocal on WOT but quiet on cruise, which I was very surprised about.
Anything louder would make you look like a "boy racer" IMHO

I also think it is more than big enough diameter to support any mods this side of turbo charging, but that is a another debate altogether.
I made 137.8 KW ATH with OEM CAT and not other mods.