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78 Concord Wagon Update

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matty 401 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote matty 401 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/17/2018 at 12:55pm
what is wrong with the mufflers  ??? 

72 matador 401 the beast
79 concord 2 door
72 matador 304 grasshopper
68 Rogue 360
93 Cherokee 2wd 4.0 5 speed
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one bad rambler View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote one bad rambler Quote  Post ReplyReply Direct Link To This Post Posted: Jan/17/2018 at 2:18pm
Originally posted by matty 401 matty 401 wrote:

what is wrong with the mufflers  ??? 

I like them for fender well headers but under the car with no tail pipes you choke on the fumes...there load...pretty restrictive...my son bought side pipes for the car and the fist thing i did was make a set of glass packs for him using a set with 3 inch in and out with a 3.5 inch case..They breathe quite well and have a deep tone....
68 AMX 390 4 Speed,68 American,64 American 2 Door Wagon Altered Wheelbase,78 Concord Build 360,727,8.8
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farna View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Jan/18/2018 at 8:29am
So you actually have four glass packs... two on each side, welded end to end. Different...
Those header muffler look like they exit under the car right at the B pillar, no wonder you're getting fumes in the car! You'd need to extend them to exit right in front of the rear wheel... That would help, but may still get some fumes inside at times (like sitting still and idling) due to the back doors being right at the front of the wheel well. Good door seals help, but probably wouldn't keep all out.


Edited by farna - Jan/18/2018 at 8:32am
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one bad rambler View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote one bad rambler Quote  Post ReplyReply Direct Link To This Post Posted: Jan/18/2018 at 7:59pm
Originally posted by farna farna wrote:

So you actually have four glass packs... two on each side, welded end to end. Different...
Those header muffler look like they exit under the car right at the B pillar, no wonder you're getting fumes in the car! You'd need to extend them to exit right in front of the rear wheel... That would help, but may still get some fumes inside at times (like sitting still and idling) due to the back doors being right at the front of the wheel well. Good door seals help, but probably wouldn't keep all out.
I had made a video showing the massive restriction that the org. glass pack that came with it had...2 inch inlet and a 1 1/16 core for 52 inches....The way the new mufflers are swedged the inside diameter stays constant and i have 36 inches of perforation surface..3 inch in and out...plenty of surface area to absorb each exhaust pulse at lower rpm`s but free flowing at upper rpm`s...and with a 3.5 inch case they fit nicely beside the shields...It`s hard to beat a simple glass pack
68 AMX 390 4 Speed,68 American,64 American 2 Door Wagon Altered Wheelbase,78 Concord Build 360,727,8.8
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