Got the Ultimate Racing Racepipe installed over the weekend. Even with the high flow cat on it, there is a noticeable increase in in-cabin volume above 3k RPM. While idling, it sounds the same as when I only had my Magnaflow CBE. Above 3k RPM, it makes the exhaust come alive and car sounds more aggressive. I like it and the wife likes it too. Volume levels are still pretty conservative. I think once I get the Ultimate Racing downpipe installed, the volume level will be perfect for what I want out of the car.
If you have the Magnaflow CBE and you think it is too quiet, install a Racepipe before deciding on a different CBE.
Not sure how much of a performance improvement it provided since I flashed to the basemap from Dizzy Tuning right after the install. That reminds me, I still owe Jason some datalogs.