I have 1 305 TBI I had the cat and the 80 series flowmaster on for a while and I noticed it did get louder but my Question is will it get louder again since I replaced the cat with a straight pipe? Since more air flowing?

 

maybe. Mine took weeks if not months to get as loud as it did.

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-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)
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Got Beach?

 

I'm sure you noticed an increase in volume from deleting the cat, I'll assume though since its already "broken in" its probably not going to continue to get louder, but i dunno. I never really figured out how flowmasters get louder after a while, since theres no packing to burn. Anyone got any theories?

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88 Camaro (The mighty LO3 SC!)
305TBI/700R4/2.73/123,XXX miles
14" Open Element and Flowmaster 80 seires

Next up: headers and gears