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Re: Flowmaster question
Flowmasters noise estimates are generally loud. Their market is the racer crowd. For the most part the larger the number the quieter they are.
X-pipes will help reduce the noise and if you end up with the classic Flowmaster drone you can add a J-pipe to reduce or remove it. Nowadays there is a lot of information on how to make and install them. They were factory on 1968 Pontiac GTOs so they're nothing new.
https://strikeengine.com/helmholtz-r...j-pipe-length/
Good luck.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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