fabbed mustang 3.7 shorty headers to a custom mid pipe full 2.5" all the way back to dynomax axlebacks I previously had a resonator delete when I had stock manifold cuz the dynomax axlebacks were to quiet but now that it's catless it needs a resonator bad the dynomax axlebacks now sound terrible going to add a 26" magnaflow resonator to see if that will help but I may have to change out the dynomax