If you consider louder and tinny to be better, it's probably the muffler for you. The 4.0 SOHC has a high, pitchy tone. Higher you wind it, the worse it sounds. JMO
Exactly, my friend put it on his 2006 f150 its has a 5.4 triton engine and it sounds like its powered by rice. But on the other hand my other buddy put it on his 01 sierra and it roars. Defiantly not the muffler for me