I have the ark exhaust with aa downpipe. With the stock downpipe it does get louder but deep maybe a bit louder than the hks. With the the as downpipe it’s even louder but not obnoxious or drone. In normal mode it’s pretty quiet which is the main reason I bought it. Videos that are online...
I have a 23 non premium. What I did so far was buy a add a sub harness from technic pnp that taps into the amp harness to give you the rca outputs and remote out. Makes it very plug and play. Put just one 10” shallow mount mb quart in the trunk with an alpine mono amp. Helps the sound tremendously.