I'm still loving these super turbos but I still want it quieter, gonna add an H-pipe next week.
Who makes the best fitting tailpipes for a '72 Duster with stock gas tank and leaf springs? Holy crap Bob, are you serious?  The H pipe will def. help. It even toned down my 4" exhaust w/ 1 chamber race flowmasters a decent amount. Made it sound a lot better/smoother.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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