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In ‘74, the 360 made it into the Duster. Not what I’d call a peppy engine year for any car.

That is an H pipe, IDGAF what Holley says it is. I’d return it if I opened up the box and seen that. That’s just me. Not an X pipe!

Oh course it did. I’m sure it also got 27 MPG’s and ran as clean as today’s cars and lasted 750,000 miles before it needed a spark plug replacing. Gloating is pointless and makes you sound ridiculous. Have a great day.

Hey Bruce. It’s really this simple, the OEM exhaust system was horse power stifling. The sound of the car was what it was and just fine IMO, however, many people want to increase the sound level and/or the sound. Swapping out or changing the muffler and/or the entire exhaust system adds power...

Other than the great fitting but a bit pricey TTI or Doug headers, the best fitting and amazingly cheapest header I found is the best one I have used with a thicker 3/8 flange (longer header bolts required of not in the box) are the headers by Summit Racing. I have a set in use right now. But...

What cpearce said. Pulling the transmission is easier with true duals. And H pipe can cause some interference while the X is dead in the way. There is that exhaust note sound change which is mostly heard different under a heavy throttle & wise open. After that, the power difference in most...

Soooo disagree with this. The state of tune will have an effect however the sound waves are the reason for droning. Goggle Helmhurtz or some spelling to that effect.

IMO, since I have both systems in place on two cars, it’s more about sound since the difference in HP is so little it’s silly. The “H” pipe has more of that traditional muscle car sound while the “X” pipe will smooth out the exhaust pulses mellowing the normal idle pulses your used to hearing...

If the sound isn’t all there for you, choose the muffler you want to use and install it. The kit can come without mufflers. FWIW, they performed very well on the Engine Masters show. Dynomax mufflers are a little quieter and have more low tone. Hooker Aero Chanbers are about the same with an...

The car engine was stone cold on this November day where you can hear the Jegs (Summit the same) exhaust kit and mufflers on a low compression 318 w/Hooker 1-5//8 headers recorded from the cell phone. (Old video)

There are members here that have in the past, just wait on there responses. As I have only done the 2-1/2 kit, I echo the above. What I do remember about the 3 inch kit is obviously it’s a bit tighter and with moved in springs, it’s a no go. The tubes are too big to fit with the springs moved...

Best cheap header = Summit racings offering. The draw back is 3 tubes under the steering linkage. Otherwise they have always fit excellent and have a thick 3/8 header flange. In a tie, Doug’s headers with TTI headers. I have used the TTI. Near perfect fit, thick flange, no tubes under the...

They fit for me and I put them on the ground as described to you in your other post. They’ll go in.

Have you read up on David Vizards exhaust recommendations? Regarding the pressure wave cancellation boxes to allow maximum torque output?

These headers having 3 tubes go under the drivers side steering linkage are the hardest to install. Without a lift, there a super PIA to put the drivers side in. Normally I’ll do the driver side first since the passenger header can stop the amount of room available to tilt the engine over. I...

Yea man, you got it. No problem. The Summit header is the old school design which I’m not normally fond of since 3 header tubes go under the drivers steering linkages which brings them close to the ground a bit far forward vs the others which are not so close to the ground and further back...

WOW! I MISSED THIS POST!!!! 2 more cents added in….. Top headers are the TTI& Doug’s. They are pricey but worth it. IF inexpensive is the call, then the typical 3 tubes under the drivers steering linkage headers are it. There’s only one choice I’d make and I’ve used many brands over the...

I personally wouldn’t try double exhaust gaskets. It may hold, but I’m not too warm and fuzzy on the idea. Worth a shot! I second that. Even on a very mild cam and compression engine, it’s a winner.

That’s engine build specific and…. LOL….. Depends on your opinion of “The in’s the crap out of the engine.” That’s starts at 7K for me….. but that’s just me…..

Ditto Long Island, lived my second half of life in Suffolk county. The exhaust manifolds are the most quiet and heat easy in the engine bay. Headers release more heat, coated, slightly less. If they’re wrapped, heat is close to exhaust manifolds, but there’s caveats to it. The wrap retains...

Thanks Jim.

Sounds like ya got it whipped. Excellent. I never had to deal with that kind of heat you have. I have to agree that the aluminum does run cooler. This was in lower New York. What kind of fan are you running?

Sounds awesome except, you want no chance of detonation? What cam, compression, and timing are you running? Why would an iron head have this over a aluminum head? I get the outdoor heat factor of where you live.

Did you already purchase the cylinder heads? Personally I don’t see a point of using exhaust manifolds for a head described as a street strip head when very similar performance (and air flow) and be found with the OEM head with some porting. It would more than likely be cheaper and certainly...

Build your own with galvanized steel or stainless steel.

A 2-1/4 pipe size should be able to support 400hp. The problem is the muffler is cutting power. My question to you is, how much HP does your engine make? How quite do you want your exhaust?

Your minimum pipe size is 2-1/4. Smaller pipes will not improve low end anything. Correct Ridiculous 100% false There is truth in that. Not correct Good question

OH! If you’re looking for a dead stock sound or one with just a minor rumble, your muffler choice is the real dictator of sound. A longer muffler will be quieter. Dynomax offers a line they call Sound FX. These could probably pass as stock HP mufflers. Under a low compression engine, they’ll...

Thanks Dave! Good explanation. I’ll add two duckets…. The X & H pipe also offer a slight change in sound. Very minor. Being that the exhaust pulses are shared. The following descriptions apply with with a upgraded and a bit warmed up engine in the power department. Do note this. Sound through...

The complete TTI kit is easiest to install yourself and it’s all in one box. X or H pipe. The system can be bought with or without mufflers. They can include them and they will be Dynomax turbos. TTI also head pipes only if you want. Also tail pipes by themselves. From there you can construct...