I have 40 series Flowbastards on my Charger also & got sick of the resonation while driving. I added the 18" Dynomax glass packs to the tail pipes like the factry resonators & man what a difference. So much quieter, no more resonating & my ears don't ring for hours after driving it for awhile now. Wish I would have done it years ago now.
1963 Belvedere 440 Max Wedge Tribute
1970 Charger R/T S.E. 440 Six Pack
1970 Challenger R/T, 528 Hemi
1970 Charger 500 S.E. 440 4 BBL
1970 Plymouth Road Runner 383
1974 Chrysler New Yorker 440
1996 2500 RAM 488 V-10 4X4
2004 3500 Dually Cummins 4x4
2012 Challenger R/T Classic.
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