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Stainless steel does not conduct heat as readily as steel, so more heat stays in the exhaust stream. The task of a muffler is to quiet the sound, and all the various construction methods (glasspacks, chambered, reverse-flow, etc) do this by taking energy out of the flow. So I suspect it makes...

It's always easier said than done, but I would try to weld a grade 5 bolt into that sleeve. Welding a nut on is more difficult as you either need to get the weld inside the nut (not easily done for a 3/8 size nut), or if you weld on the outside you risk welding some of the hex away. Plus -...

The Dakota headers are a good choice. Another really good option is the manifolds from a 5.2/5.9 Magnum, they flow really well, reportedly on par with the early 340 manifolds, which are highly regarded for flow. The 92-93 versions have a slightly larger outlet from the later ones. But either...

FWIW, I have Heddman shortys on one of my cars and love them. Took about 15 years to get a gasket leak (copper gaskets at the heads) and I think the leak is at the collector (as-supplied gaskets). But it seems to have plugged itself up this year and is barely noticeable under hood. (still need...

Ran across this video recently, where @tallzag mentions the 72 C-body U-codes have an HP manifold on the passenger side and a std log on the driver side. (IIRC that's what he said, and what I saw in hte video). So that's opposite of the cars noted above.Maybe that's why the 'musclecars' had to...

Prepare that 1 or more studs might be bent/snapped also?

Old thread but I wanted to comment on this. I have the Hedman shortys on 1 car and they fit really well. They do NOT require that RobbMC starter - a regular 5.2/5.9 Magnum starter works fine (after you remove the 2nd set of wiring terminals). No block-grinding for the starter. Reportedly there...

FWIW, I have a neighbor that does woodworking, or furniture refinishing, or ??? Often well past dark, so I hear it when I take the trash out, etc. I do a bit of woodworking too, so I'm pretty confident the tool I'm hearing is just a small 5" finish sander. But the thing is - I can hear it from...

Perhaps he won't listen to Dad, but maybe tell him a guy you know on a forum said that WILL affect his hearing when he's older.

It was stock but not just a vanilla car, though. Was a 2022 hi-po model, with a 'sport mode', so apparently has a factory variable-baffle muffler or something controlled by the ECU.

As a former engine-cooling fan engineer, who has mild understanding of the caveats to *consistently* measuring sound via pressure (which is what dB is) vs measuring sound power (which is consistent and comparable across test results) I seriously doubt that CA knows their level of ignorance on...

That guy did a stellar job! Got everything tucked up nice and tight, and terminated the tailpipes properly. Can we see the rest of the car?

Cats will need to be located in approximately the same location (front-rear) as the OEM location. The cat needs the right amount of heat for proper operation, and teh laws probably also specify that OEM location is mandatory (for that reason). Most shops around me in the 80s-90s wouldn't...

IMO, on a car of that type, don't do anything to detract from its character/dignity. To me, even visible chrome tips at the rear bumper look out-of-place on this type of car. It is not a hotrod and never will be (that's not what this car was born to be). I would also suggest not to make it...

Shorty headers on a 68 Fury with 440, but it's a standard hardtop and not a fasttop. Forums / Performance Tech / Hedman shorty header review - C-Body DryDock

What camshaft? (sounds nice, BTW)

From my experience, both of home-built and aftermarket kits - how much the pipes droop at the trans x-member and front floorpan area is the mark of a good kit. IMO always looks best if, standing 20 ft beside the car (not crouching), you can't see much of the pipes.

@ Gerald Morris: Can you post a few pics of the result? Such as tailpipes as viewed from the rear, both standing up and crouched looking straight into the license plate. And a side view showing how much the pipes hang down in the front floorpan area? Photo for posterity of the ebay kit...

Old thread, but wanted to respond for future folks that might have this problem... Any water leaks on the front floorboard area? A rusty cowl is another way engine compartment smells can intrude, and this can include smells from oil drips and weepy gaskets. Look under teh dash with a pencil...

Drilling/tapping them for pipe plugs, or installing a 3/8-16 bolt with copper washers and a distorted-thread locknut is always my preference over welding them closed. Welding cast is a lost art and I don't want to risk introducing a crack.