This is gonna sound stupid, but how do I knwo if I have a Flowmaster 80? Is it loud? IS it marked? Cuz my car rumbles, just VERY quietly.

 

does it look something like these?

------------------
-Tas
'89 Formula WS-6

305, TBI, 700R4, P.A.W. 14x3 open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips, Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248)
Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options

 

it doesnt have that strip goin down the middle.