Borla is doing a small redesign to the 11789 for water drainage. Through a source at Borla I can buy for 550 + shipping and would offer you 450 + shipping. Let me know, thanks.
How can you go wrong with a full money back gaurantee - nobody other than Dynomax does this - please post sounds if you have installed these ! Ship it.
Are the internals of the Dynomax axleback muffler truly tuned for the 2011 Mustang or is it more of a generic fitted to the car ? Also did Dynomax have to work on a combination that eliminated drone as a few manufacturers have done ?