really loud if you dont have cats. to loud for every day use.i had to put my stock h-pipe back on because the car became annoyingly loud after a while it started to bother me.
I like my flow 40 series. I heard that the 30 series race muffler is louder then the 40 series ive been thinking about getting thoes. The 40 series sounds awsome at wot and pretty good just driving.
I am running MAC equal length headers into an offroad H pipe into 1 chamber flowmasters with 2.5 pipes... IMO, people overexaggerate how loud these things are.. They are LOUD dont get me wrong, but not as loud as where you would be getting tickets left and right.... from 0-2500 RPM, they sound like 2 chambers... from 2800 up, it sounds like open pipes and can be heard for about 2 miles down the road... i love em