I currently run the 2.25” Borla Street non-resonated catback and wonder whether adding a resonator will appreciably reduce the exhaust sound in the cabin. I’m leaning towards a Vibrant resonator, but am torn between their oval Ultra Quiet and a bottle-style.

Has anyone here installed the Ultra Quiet on their R53? Does it work? Does it fit (dimensions are 9.75” L x 4.75” H x 6.75” W)?

Thanks in advance!

Vibrant's "Ultra Quiet" would have been what I chose but a different problem and different exhaust. Read and see all that in post # 311 in my sig topic, but I had insufficient clearance for either the Milltek res-pipe can or that Ultra Quiet in the normal fitment location (due to extended B&M SSK box), so I installed Vibrant's 18" x 4" bottle resonator in the aft location. It did help but would have preferred their 18" x 5" bottle resonator if not for concerns about creating vibration rattles back there. My primary issue was upper clearance, however can width of 6.75" would likely have had insufficient clearance to sides of the tunnel below the shifter box. BTW, if you choose Vibrant, they make some nice clamps also shown in that post.