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Please @VOETOM check over this... But here is my thinking. When air temperature lowers it takes up less space. PV=nRT Seems like EGT's near manifolds 1000 deg F. And tailpipes at 500 deg F. So.... 34% drop in volume in ideal situation. But shouldn't be way far off from reality. If volume...

NOS can differ from Factory Assembly-Line Installed. For a reproduction part, good assembly line take offs should also be examined. Tom said his tailpipe was "stock" off his 69 340 (Barracuda). So I'm taking that as an original assembly-line part, taken off.

I did that same switch, but had stock 340 exhaust. No issues. The TTI header I use are the same for 67-72 as 73-76 K-members

TTI has an excellent quality shorty header too. And they sell the headpipes that connect to them too. That can save you money going to a muffler shop for custom headpipes. the stock hipo exhaust manifold come close and snake around stuff too.

TTI or Dougs headers here’s TTI in my power steering car with a 73-76 V-8 k-frame. the power steering brackets sit way in front of headers. I used the 70-76 power steering hose that went for my Saginaw pump and 70-76 aluminum water pump style pump brackets

turn downs before axle equals increased interior noise vs exhaust to rear bumper. 3” full exhaust over the axle and past stock gas tank is tough to pull off on an A-body. Not much room between leaf springs and gas tank. It just opens up another set of issues. Issues = increased skills or money...

Dynomax turbo’s, 14” IIRC, I have the full TTI headers to tips, 2 1/2”, x-pipe crossover, The mufflers that come with their kits. TTI muffler hangers from Stock dual exhaust chassis mount. I later put TTI stainless tips on it.

Mufflers have a big impact. Flowmaster 40 is going to sound a lot different than a Dynomax Turbo and does blueprint have different versions of their 408’s with different cams?

I apologize. It was not meant into rain on your parade. It’s for the others reading these threads to get correct info. It’s a large public forum with a good search function. This thread has a lot of views. And other people reading for information.

Steel.

I never seen anything that said Doug’s are stainless steel. I think the coating on them is confusing you.

You are right that is an option. there are some thread on FABO if you search a person can see the work it took to install them.

not near the quality of TTI. A guy in our club had a set and had the rewelded once then got second set. and they don’t come with a head pipe flange. And the outlet is in a very tough place that requires a lot of skill and time to make the head pipe flange and head pipe AKA $$$

you just need to buy the TTI headpipe for shorties to mate to you TTI system. usually less expensive than having someone make head-pipes

This is the 70-71 parts book for tailpipes. It doesn’t show sizes. But it does show what cars shared the same tail pipes It shows: 70 Duster 340 and Swinger 340 without tips as same part number 71 Duster 340, 71 Demon 340, and 70 Swinger 340 with tips all with same part number.

Interesting.... The other RTS ads I looked at before didn’t have that. But I do remember that ad. so is that one year only tailpipe ? What ir3333 posted and from the Accurate LTD site show a tailpipe that starts 2 1/4” and ends smaller. 1969 Swinger 340 cars do not have tips. Also, 71 Duster...

My Barracuda is an original 340 Formula S car. It is High Performance. I don’t see anywhere in the RTS ads that say full 2 1/4” exhaust Accurate LTD offers 2 1/2” , 2 1/4” and 1 7/8” tailpipe outlets. They don’t say which is OE.

From accurate LTD

that’s advertising i have the original tail pipes from my 68 340 Barracuda they are smaller than 2 1/4” the tips are 1 7/8 diameter [WANTED] - NOS 1970 Chrome exhaust tips 3466066

Exhaust air cools tremendously as it goes from the cylinder head to the tail pipe. You can move same amount of air from the headpipe flange through a smaller tailpipe end diameter because the cooler exhaust air gets more dense and takes up less space. different exhaust velocities will should...

I don’t believe so from the factory. IIRC they get smaller after the mufflers. Look at the OD of a factory tip.

It is 2 1/4” to give sufficient clearance.. Just measured mine in garage Here’s the 68-69 repro kit:

The 70-71 big block kits are worth more. Here’s one 70-71 in a Mopar box that actually sold for $185 shipped SOLD - 3420046 Heat Riser kit 383 440 Without box and being 68-69 BB you’re looking at under $140. Then add $20 for the extra thin weight. ~$160 Shipped. For $617 you can buy brand...

Yes

Is it a thin or thick dampener (weight) ?? From mccannix (Terry McCann) with picture examples: This is another view of the thin dampener https://board.moparts.org/ubbthreads/ubbthreads.php/ubb/download/Number/323159/filename/100_4299.JPG

Here’s the repro for $145 Heat Riser Kit 1968-70 340, Exhaust Manifolds/Components, 199-DR085 Reproduction, NOS and Used Mopar Muscle Car Parts It does not have stamping on the round weight like originals. I think even most (all?) NOS is actually different than OE. Originals factory ones have...

What does the valve measure across in diameter? The early 340 manifold kit is different than the later kit. BIG price difference This is an over $150 kit. Lot more, if 340. I bet some parts flippers are already PM’ing him The repro is $150

Yep. Schumacher mounts, Schumacher conversion brackets, 40-50 year old cars that we don’t know what the frames and chassis have been through. All kinds people have hacked and wrecked on these cars over the years. Also you got aftermarket replacement wearable chassis parts that sometimes don’t...

TTI makes a 2.5" headpipe for that. The 73 drivers upward horn hipo manifold has the same outlet diameter and head port geometry as a 340 '68-'71 hipo drivers manifold. Problem is the passenger side 71-73 340 manifold is log type and smaller outlet diameter.

I ran 68 340 HP manifolds on my 68' 340 Barracuda S with 73-76 K-member. No problem.