· Premium Member
Just wondering if using a free flow muffler such as a glasspack vs fancy name brand free flow like Borla has any performance differences? or if the mufflers are just a matter of preference for how they sound? I'm assuming of course that both mufflers have the same inlet/outlet sizes. Does the Viper need backpressure? ie: better to go with the biggest that will fit as far as piping etc?