X-pipe

[81LT4]

Can anyone tell me if it really matters where a X-PIPE is located?
Should it go as close to the headers as possible.
Middle of the car.
close to the rear.


This is for my 81, I made my own X-PIPE. I notice, if it goes as close to the header as possible, that would be a little behind
the transmission. (about 10 inches behind)

So where is the perfect area for this.

PS, FOR THOSE THAT DONT KNOW, I HAVE THE 700R4
WHICH IS LONGER THAN THE TH350.

 

[81LT4]

OK, DONT EVERYONE TALK AT ONCE.

 

[Robin7TFour]

hello, tHAT should be a good location for the x-pipe. i can remember on my old cars the muffler shop usually put an h-pipe just past the tail shaft
it smoothed out the idle pulses and was suppose to help with the flow of gasses out..

best to you

robin

 

[MaineShark]

Are you talking about an X-pipe or an H-pipe?

If it's an H-pipe, I hear that the correct method is to locate it as close as possible to the hottest point (found, I recall, by painting the pipes then letting the car run a while to see where the paint starts bubbling first).

Joe

 

[Evolution1980]

Are you talking about an X-pipe or an H-pipe?

If it's an H-pipe, I hear that the correct method is to locate it as close as possible to the hottest point (found, I recall, by painting the pipes then letting the car run a while to see where the paint starts bubbling first).

Joe

I'd agree. I seem to recall reading that somewhere here a while back.
And as I always chip in regarding these...make sure it's an X that you want, and not an H. They serve two different purposes.

 

[resto75]

I'd agree. I seem to recall reading that somewhere here a while back.
And as I always chip in regarding these...make sure it's an X that you want, and not an H. They serve two different purposes.

What is the difference ?

 

[MaineShark]

An H-pipe is like a dual exhaust, with a pipe that goes from side-to-side, connecting them. It balances exhaust pulses and improves low-end torque.

An X-pipe looks like an X. The two sides connect together, then split again. It improves top-end.

Joe

 

[waterboy1976]

X pipes flow smoother......the exhaust gases have a more direct shot whereas an H pipe they almost (well have too) change directions 90 degrees...have an X pipe on my 73 behind the cross member

 

[resto75]

Which does the best job of lowering the resonance with a set of flowmasters ?? I would think the H pipe would be the easier to install in the present system

 

[stumpy]

I got an X pipe on my Impala with my cat back from spin tech. I was told that it gives better performance than an H pipe and is supposed to be quieter too. The X is about 6 to 8 inches past the output shaft on the 4L60E.

I had quite a bit of resonance with the whole system until I changed the tips (bought the stealth turn downs by mistake). However, I'm not convinced that resonance is caused solely from tip lenght or placement. GM added weight to the right side exhast pipe just past the converter to help deaden some of the resonance from the stock exhaust. I have just a little resonance left and want to try putting some of that weight back on to see if I can eliminate it completely.

Good luck, HTH.

 

[Glensgages]

An X-pipe looks like an X. The two sides connect together, then split again. It improves top-end.

?
I thought that an X-pipe went BETWEEN true-duals (like a 'by-pass'), not CONNECTED them.
?
So I'd gain the same thing just gutting my cat as I would by running BOTH sides 'into' the X, then back out again?
:confused ;help

 

[81LT4]

THIS IS THE X-PIPE, NOT H-PIPE.
I JUST WANT TO MAKE SURE IT GOES IN THE RITE PLACE.
I WILL MOUNT IT BEHIND THE CROSSMEMBER.
FOR WHAT I UNDERSTAND, THIS IS BETTER THAN THE H-PIPE.
I WILL LET EVERYONE KNOW WHEN I INSTALL IT, AND IF I NOTICE A DIFFERANCE. FROM COLLECTER TO MUFFLER WILL BE 2 1/2.

 

[81LT4]

?
I thought that an X-pipe went BETWEEN true-duals (like a 'by-pass'), not CONNECTED them.
?
So I'd gain the same thing just gutting my cat as I would by running BOTH sides 'into' the X, then back out again?
:confused ;help

I HAVE TRUE DUALS, I HAVE A CROSSMEMBER FROM BOWTIE
OVERDRIVE, THIS ALLOWED ME TO RUNN PIPES ON BOTH SIDES
OF THE TRANS. THE TRICK IS PLUMBING THE SYSTEM AS KICK ASS AS POSSIBLE. AND FOR SOME REASON MY CAR WAS DRUNK ONE NIGHT, AND WHEN IT CAME HOME, IT FOUND OUT IT LOST ITS CAT'S. REALLY ITS BEEN THAT WAY FOR A WHILE, AND WILL NEVER GET NEW ONE'S.

BUT I DO HATE THE SOUND IT HAS UNDER A LOAD,
LIKE POPPING CORN. WHITCH IS WHY I OPT FOR THE X-PIPE.
I WAS TOLD IT WOULD STOP THIS TO.

 

[MaineShark]

So I'd gain the same thing just gutting my cat as I would by running BOTH sides 'into' the X, then back out again?
:confused ;help

Not quite. The effect would be similar, but not on the same level as a properly-designed X-pipe. The X-pipe converges and immediately diverges, without a long section of straight pipe, like the gutted cat would be.

Joe

 

[UKPaul]

I've got an '81 with true 2 1/2" duals & BTO TH200-4r with BTO x-member. It used to pop & crackle & drone with an MA true dual system. When I fitted the BTO x-member I took the oppertunity to make my own dual system & fitted an "H" in there while I was at it. The "H" is fitted just behind the x-member & has made the exhaust note much more mellow & has completely stopped all the popping. Everything I've learnt about "X" & "H" pipes is that the "X" is better for performance as the gas doesn't have to do a high velocity 90deg turn, but the difference in power isn't worth worrying about unless you're after as much power as possible. I did consider an "X" pipe but the exhaust system was a lot simpler to make with an "H" in it. Hope some of the above helps!

 

[MaineShark]

Some restriction aids low-end torque. The H-pipe will improve low-end, while the X-pipe improves top-end.

Joe