That's gonna be from the whole package. MBRP itself is excessively loud.. then you remove the cats (which act as mufflers of sorts) which is where the rasp comes from and the MBRP just magnifies the whole sound. Either need to add additional resonators to the setup to remove the rasp or try quieting down with a better built exhaust. I generally opt for high flow cats for this exact reason. I cannot stand any rasp in my exhaust. A few extra hp are not worth the noise to me.
That said I really like my Magnaflow Overland Series. It's high clearance with no muffler tip to get hung up on obstacles, has an exit after the rear axle to reduce drone, and offers 3 sound-level options with a straight-thru muffler design. Really cool tech. Before I deadened the truck the loudest option was still pretty quiet. Since deadening (which eliminated most of the tire and external noise), I have changed to the medium quiet for highway drone as it's all that I can really hear now and it's a little too quiet. Super happy with this exhaust overall though. Can't go wrong with MF on almost any platform. Should be perfect volume for when I change out the Y-pipes.
The MagnaFlow 3rd Gen Toyota Tacoma Overland Series Cat-Back Performance Exhaust System #19583 brings MagnaFlow’s signature deep rumble and dyno-proven performance to your overland 3rd generation (2016-2022) Toyota Tacoma.
www.magnaflow.com