Long story short, my 4Runner sounds like a monster. The majority of exhausts I've heard on 4Runners and Tacomas with my same engine sounded ok, but were a little high pitched and ricer sounding to me. Henry's ensured me that wouldn't be the case with mine, and wow were they right. It has a very deep rumble that progresses into an aggressive purr through about 2000-2500 rpm. Past that, it transforms into into a deep, throaty roar that resembles an angry version of a GTR. Downshifts with throttle blips usually result in some lovely crackles/pops. It is also surprisingly quiet when cruising, which was pretty important to me since I frequently travel long distances. On another note, the exhaust tip has survived multiple encounters with rocks, so the system is very sturdy. Henry's estimated I'd gain about 15-20 horsepower/lb-ft and both me and my friends can feel some extra power.