H Pipe diameter

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73 Grande will undergo three phase build process. Phase 1 is to make roadworthy. Phase 2 is interior/exterior restoration. Phase 3 is ++ performance.
Was wondering, since I don’t have one to touch and check, does someone know the diameter of the H Pipe segment of the exhaust system, if the main pipes are 2.5”? I want to include one in my stick build and do not need to conduct the engineering analysis to determine it‘s size. Was thinking a 2” H Pipe would do it. More experienced thoughts?
 
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1972 Mach 1 Q code
2007 GT
1969 Cougar Eliminator B302
CSX 7000 Shelby Cobra FIA
2020 Edge ST
2002 F250 V10
I have heard everything from 67% of exhaust pipe size up to 100% of the exhaust pipe size. I use the 100% sizing method. There is also debate on what size the hole in the exhaust pipe should be. I use about 90% to ensure a solid weld. Placement should be, according to many, between 8 and 18 inches form the end of the collector. In reality it comes down to where you have the room to put it. A cross over any where is better than none at all. Chuck
 
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73 Grande will undergo three phase build process. Phase 1 is to make roadworthy. Phase 2 is interior/exterior restoration. Phase 3 is ++ performance.
Thanks Chuck. I’ll map out a spot between those dimensions to see what I’ve got to work with. With shorty headers, I suspect it might be further back.
 
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1971 Mustang Sportroof M code
Was wondering, since I don’t have one to touch and check, does someone know the diameter of the H Pipe segment of the exhaust system, if the main pipes are 2.5”? I want to include one in my stick build and do not need to conduct the engineering analysis to determine it‘s size. Was thinking a 2” H Pipe would do it. More experienced thoughts?
I agree, a 2" crossover pipe should be sufficient. I believe that every "H" pipe I have seen, either factory or aftermarket, have a smaller diameter crossover pipe. They do not carry the full exhaust pulses, just help the equalize the pressures and help with exhaust reversion, as well as improve efficiency and reduce the staccato effect when running loud mufflers.
 
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Fort Mohave, AZ & So Cal
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73 Grande will undergo three phase build process. Phase 1 is to make roadworthy. Phase 2 is interior/exterior restoration. Phase 3 is ++ performance.
Yes, I hoping more for the lowering of the exhaust drone. I’m using Flowmaster Pro mufflers, so any help will be good. Thanks for the info, Steve.
 
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1972 Mustang convertible, 351C 2V with FMX (#'s matching)
Currently equipped with 351C 4V 4BM, .060 over, roller cam, Sanderson block huggers, -AC
This set up is with 1 7/8” Sanderson’s and SS Magnaflows and a C4.
It all depends where you find the space to install the X or H… Good luck with your setup!
 

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