my 2000 mazda mpv sounds like a motorboat. louder as i accelerate. on 2000 Mazda MPV

my mechanic says it is a crack in the rear exhaust manifold where it joins the catalytic converter. cost $1100 to replace. does this sound right?

Asked by for the 2000 Mazda MPV
1 answer
yes the manifold and catt are combined on this model. if its cast steel maybe it could be w/ muffler shop