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WIZE - even the engineers at Dynomax don't talk like that!

Gus, here's my recommendation:

Run a pair of Ultra Flow Welded #17233 (20" bodied), or #17235 (24" bodied). Depends on what will fit under the back seat area. I can build you a pair of 4" diameter resonators for extra noise control at the rear if you have room. The longer they are, the more noise they will knock out. They will have 3" necks & cores, plus a GOOD quality fiberglass packing that will not blow out. I can build them in any length - up to 40" long.

The car you saw with the TTI system was probably running Super Turbos #17793's or 17769's. I have a buddy with a '70 Challenger 440+6 that is running those in his TTI system. The packing blankets broke-down in the mufflers & now the car is hideously loud - TOO loud! Heck, my 3" chambered mufflers would be quieter than those now.

-Eric

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Thanks for your expertise Eric The mufflers I seen were the 17769 mufflers.I am just looking for something quieter than the 40 series 2 chamber flowmasters I am running now.
Gus