Does anyone have the actual dimensions of the primary pipe / pipes off the GX manifold?

My 1200GX is in a Triumph Spitfire and some stoopid #### that did the conversion built up an exhaust pipe themselves from the manifold down - and it has two horrible pipes that meet within 3 inches of connecting to the manifold - the bends are horrible and must be restrictive - it then runs into a 1 3/4" pipe.

What I'd like to know is how far two pipes should be run from the twin outlet on the GX manifold - and what size the two pipes should be before they go into a collector.

A picture would make me happier than 6 cups of coffee.

Greetings Dodgeman!
It seems to me that the 200B is the old farts car, because that's what I drive, obviously in a little more spirited way than you do, but as you say, to each his own. Mine has a mild cam, a 32/36 Weber (alternatively, 2 X 1-3/4" SU's) and a 2-1/2" exhaust and it goes very nicely thanks.
I've been an engineer in the oil patch for longer than I'd like to say, and I've been building and competing with my own cars since the invention of the wheel, or so it feels. Presently, we are running number 4 (or is it 5?) with a new one on the drawing board.
My wife says that I am still an automotive adolescent--- the only change is that I realise that I am not 10 ft. tall and bulletproof like I was when I was 20, specially after a couple of spectacular crashes, but that's another story.
As I have said previously, I don't mind throwing any ideas or concepts into the middle for discussion and criticism or to test other people's contributions against my experience and knowledge, such as it is. No one has a mortgage on Nissan/Datsun wisdom, and the more you look, the more you learn.

Feral,...Datster
[blushes, scufs foot] Aww shucks fellers, 'twernt nuthin'

89mm
This has been my most enjoyable exchange on this site & it has become obvious that i am able to mix it with others of more advanced years & / or advanced knowledge. I would love to waffle on about my 200B & other adventures, but this is not the spot for it as this is a thread for 1200 GX exhaust manifolds [remember], which i can firmly state are DAMN FINE MANIFOLDS.

Perhaps there is another forum where we can meet as i want to discuss uograding my L20B with Z22 crank, rods & pistons, plus the later 180B twin Hitachis, plus valve seat inserts [200B Gas cyl head?] & cat converter. I like 'em to be Clean, Mean & Legal, & it's the latter one that can be hard to do.
Why not use a Z22 or Z24 engine? I want it to look as original as possible, right down to the original engine number.

If anyone has learned something from this exchange, then my blown out internet bill will be worth it [it takes ages to write & re-check those long ones]
I have never crashed, ever, but i am not a racer, & like you, i am fully aware that i am only 8 feet tall & bullet RESISTANT.
I also concur fully with another of your comments. It seems that the more i learn, the more i realise just how little i know.
Every time i add some new thing to the pile of learning, it just gives me a better view of the size of the ocean of knowledge yet to be absorbed.

Looking foward to more
Chris
P.S. Did i mention just how good GX exhaust manifolds are?
GX EXHAUST MANIFOLDS ARE REALLY GOOD [just to make sure that i stay within the thread.]

Re Z22/24 Engines
We should probably start a new Thread, because we seem to have moved marginally away from the original ---GX Exhaust Manifolds (they are better than stock, but HEEEVVY.)
Dodgeman, the link, "Nissan Engines" on the right of your screen will, I think, answer all reasonable questions. Good value and worth a look.

Hmm, amazing thread, but aren't we missing the simple fact that any potential increase in h.p. would be nearly insignificant in real world application?

No header / extractor or free flowing manifold will ADD power. It will REMOVE a bottleneck if this is the problem, & allow the engine to develop all the power that it can. That power level is completely dependant on the engines ability to ingest & burn fuel. & on its ability to convert that burnt fuel to work output EFFICIENTLY.

The cast GX manifold is NOT all that heavy, & as i have writen, i defy anyone to DEMONSTRATE the measurable vehicle performance loss as a direct result of the additional weight of the GX manifold over the weight of extractors.
Chris