I love my Solo set-up and wish it was a little louder. I ran the HF cats for 2+ year before I started throwing codes last year. I think my problem was it all got a little loose as it's rattling against the cross-member now. I tuned it this year and have not had a code yet. Will do some suspension work in a couple weeks and take the cat-back off and then re-install. I'd put them on again in a heartbeat. Good luck!