what is american thuder flowmaster
Supreme Member
Joined: Jul 2001
Posts: 1,766
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From: New Palestine, IN (Just East of Indy)
Car: '85 Z28
Engine: 305
Transmission: WC T5, 3.23 posi
I believe that it's a delta flow 40 series muffler with dual outlets. A regular system would probably consist of an 80 series.
-Kyle
-Kyle
Joined: Jul 2000
Posts: 7,386
Likes: 1
From: In a mint Third Gen!
Car: Red 87 IROC-Z28 T-Top
Engine: 5.7 Tuned Port Injection
Transmission: 700R4 Auto
Axle/Gears: BW 9-Bolt 3.27
I think its an 80 Series, but I think the complete 3" uses a modifed 50 Series.
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