I had the Tomei type R single exit with my stock cat on my 21 for about a week and it was nice. No audible drone really until you got to about 80mph. Then you just crank the music about 1/4 of the way up and it’s all gone. I went with the boost logic downpipe and I think it’s pretty great this way. If you don’t plan on going catless it’s a solid exhaust. Rather loud some nice burbles on sport mode non on normal. Nice pops and bangs near redline