RAV4 2010 V6 muffler upgrade with Dynomax Ultra Flo Welded - Offset/Centered model #17514. Replaced stock muffler with Dynomax Ultra Flo welded, Stock resonator and Catalytic converted left untouched. On idle sounds like stock, but once you gun the accelerator it will start to growl. More prominent when you reach 2500 RPM. This doesn't have the high pitch or rattling sound just a nice deep sound. Maybe the resonator helped eliminated any possible high pitch sound. Didn't feel any loss of low end torque. Seems faster to achieve 60 to 90mph. Installed this not for performance but mainly for the exhaust sound. Whatever gains there maybe will just be a bonus.