Nah, now that my tint is good, I put the windows down and did a WOT pull and it seemed like it quieted down in the upper rpm. Granted that was me driving, so it may be louder outside the car. I dunno.
2015 mustang GT : I had my Magnaflow-competition catbacks done at Steeda. I am very happy with the sound and installation. Yes a bit expensive 1200 + 160 install but in/ out and finished in 2 hours. Yes they are definitely loud . I ask about Roush Supercharger,,,,Steeda will sell you one but wiil NOT install a Roush. I am guessing because it requires a bit of milling/cutting engine block bosses.