Putting my 67 GT 500 together with non-stock exhaust (have all correct pieces in storage for later). Has the 428 with JBA SS tri-Y headers on it. Planning to run 2.5" pipes with an H or X, stock hanger locations, out the rear valence. I had a small block car with the old Flowmaster 2 chambers and it was LOUD. Not shooting for that loud, but want some tone at idle. Been reading about Magnaflow, and Dynomax. And favorites out there?
Both are good choices. However, be careful, the 'Ultra-Flows' from DynoMax can be a bit loud. Not as noisy as those pesky 2 chamber Flowmasters. Magnaflow's Muscle Car turbos have a nice rumbling mello non drone tone. I suggest a Google/YouTube search and hear them both.
Spin Tech's are my favorite. Running them on my CJ Mach with H pipe. Previously ran them on a 427 in a 68 GT 500 with full 3" exhaust, Tri Y headers, and Dr Gas X pipe. I'm going to duplicate that exhaust on my 427 Fairlane.
I am not impressed by the Flowmaster 2 chamber mufflers at all. I put some on my car in 1994. By 2004 one of the baffles came loose so I replaced both mufflers with new ones. In 2014 one of the baffles came loose again. This time I got replacement mufflers from Midas guaranteed forever.
The 3 chamber Flowmasters on one of my cars are 34 years old and I never had a problem with them. I had 2 chamber Flowmasters on 1 of my cars and they were fine. A little loud but I didn't mind. I have 3 chamber Delta Flow Flowmasters on 2 other cars and my pickup truck. I love the sound and they are not too loud at all.
I never had any issue with the FlowMaster 3-chamber on the car I had for over 20 years, and they were not as loud as the 2-chamber, good sound and very livable.
Dynomax Super Turbo were perfect on my old 428 CJ Torino. Not loud or droning at cruise but nice sound on throttle.
Does anyone have the Dynomax Super Turbo on a small block? I have a 347 Stroker motor in my carryover and I have two chamber Flow master and they sound great but are to loud with way way to much drone. I am trying to decide between three chamber FM or maybe try the Dynomax. Getting rid of the drone is my main priority
Thanks
Chad
Quote from: JD on May 03, 2023, 06:57:24 AM
I never had any issue with the FlowMaster 3-chamber on the car I had for over 20 years, and they were not as loud as the 2-chamber, good sound and very livable.
There was no drone on what I had, Tri-Y headers, 2-1/4 inch pipe, 289 bored "30-over", aluminum heads.
Thanks JD
Have FlowMaster Delta-40 2-chambers on my 66 with a 347, sound great and really liked it ~20 years ago when I installed them but way too loud for me now. I'm looking for the same recommendations as OP.
JBA stainless.
Ray
I am going to suggest Magnaflow 15816 2.5" system. Complete system. I have a similar system (but 3") on my 69, it is top quality and a great sound. Stainless, mandrel bent system. Includes X pipe. I am very happy with the fit, you would probably have to get an exhaust shop to modify the tail pipes to go thru the valance, but I installed the rest of it at home.
fwiw Mike
I started with Flowmaster single chamber, then 2 chamber and finally 3 chamber and It never changed very much inside but it's not bad outside. Had a friend blast by at full throttle and I was very surprised how nice it sounded.
Roy
Turbo-style mufflers have always been the "go To" muffler design. I had them on both the 68 302 and the 69 428 SCJ. Great tone, quiet until you hit it hard, and then still good.
I worked with my exhaust guy and took his recommendation on using Dynomax turbo mufflers, 2.5" diameter and an H pipe. He kept the center section easily removable for simple clutch service. He had to heat up and slightly bend the passenger side header collector inward just a bit to clear the floor pan. The JBA stainless tri-Y headers are nice and tight to the car... just a bit too tight for collector clearance on the passenger side. Being an early car with the hand cut valence and chopped-off GT aluminum trim, we used some stainless tips that fit nicely.
Hoping this setup sounds great and maximizes the engine improvements over stock. I do have the original cast iron manifolds, and intermediate pipes with correct resonators for returning it to factory original down the road.
Still want to see it when it hits the road.
Lynnwood is not that far. Good luck.