It's also the worst flowing aftermaket muffler out there... creates alot of unwanted backpressure...
they are tough as nails tho....

stats ? .. as far as I know , they are a free flowing /minimal back pressure muffler .. it's what I have read anyway . only down issues I have read and heard on wave files .. is there loud .. but' i'm likin' the noise ..


Here's a chart for you.
i believe it because the dynomax is a straight through design and the flowmaster has lots of baffles to create the sound.

89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim