Old 06-10-2022, 12:11 PM
Drdach Drdach is offline
Junior Member
Join Date: Sep 2021
Posts: 11
Default Muffler Replacement

I have a 1970 Grand Prix SJ with stock exhaust, stock 455 engine components.I am looking for advice/recommendations to liven up, make a more aggressive sounding exhaust note....What is there now sounds quite weak in my opinion. Really just looking to replace mufflers to get me somewhere better. Not looking to replace entire exhaust. If I could unbolt and bolt something in that would be ideal.....Thanks in advance!

Old 06-11-2022, 01:30 PM
SD455DJ SD455DJ is offline
Ultimate Warrior
Join Date: Aug 2009
Location: Grand Rapids, MI
Posts: 2,814

Drdach, What is the length of the current muffler body (18", 20"?), pipe diameters (2 14" front & rear?), inlet/outlet locations (center or offset front and rear?)?

Dynomax makes lots of turbo mufflers (SuperTurbo's - quieter), or the straight-thru designs (UltraFlo's - louder) in various configurations.



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