New idea for duals over the axle(cheaper)
New idea for duals over the axle(cheaper) First some math about the cross sectional area of different sized tubing.
Cross sectional area for
2.5" = 4.90in^2
3.0" = 7.00in^2
3.5" = 9.62in^2
4.0" = 12.57in^2
My idea hinges on using a 3.5" or 4" mandrel bent tube to get over the axle, yet the trick lies in cutting the 3.5" or 4" tube down it's center and welding a plate between the two sides only to weld it all back together. This would create two seperate "pipes" like this (|) to get over the axle without the need for custom fitting and the clearance problems associated with getting two, 2.5" or 3" pipes over the axle.
Cutting a 4" tube down the middle to make two tubes out of it shows the cross sectional area to be very close to two 3" pipes.
3" = 7.00in^2
4"/2 = 6.29in&2
2.5" = 4.90in^2 which is very close to 3.5" pipe split in half.
3.5"/2 = 4.81in^2
The trick would be to make the exhaust similar to this one.
The difference would be after this point
the pipes would come together and go into the 3.5" or 4" pipe seperately. They would then go over the axle in the split pipe only to be split apart again once over the axle into 2.5" or 3" pipe to go to mufflers.
The concept is that the exhaust stays seperate like a true dual system but passes over the axle like the stock system. I'm sure it wouldn't be too hard to cut a Mufflex over the axle 3.5" or 4" pipe down the middle, weld a plate to close in one half to make a D shaped pipe, then weld the pipe completely back together like CD. There would have to be some more custom work where the 2.5" or 3" pipe entered and exited this fabbed split pipe, but I don't think it would be too hard for a decent exhaust shop or do it yourselfer.
A flowmaster y-pipe like this could be used if you cut it apart and put a divider between the 2 pipes as they merge into the one pipe.
The idea solves the ground clearance problems for duals, the problem of getting two pipes over the axle in mandrel bent form, and some of the cost issue since the over the axle pipe is already bent properly.
Cross sectional area for
2.5" = 4.90in^2
3.0" = 7.00in^2
3.5" = 9.62in^2
4.0" = 12.57in^2
My idea hinges on using a 3.5" or 4" mandrel bent tube to get over the axle, yet the trick lies in cutting the 3.5" or 4" tube down it's center and welding a plate between the two sides only to weld it all back together. This would create two seperate "pipes" like this (|) to get over the axle without the need for custom fitting and the clearance problems associated with getting two, 2.5" or 3" pipes over the axle.
Cutting a 4" tube down the middle to make two tubes out of it shows the cross sectional area to be very close to two 3" pipes.
3" = 7.00in^2
4"/2 = 6.29in&2
2.5" = 4.90in^2 which is very close to 3.5" pipe split in half.
3.5"/2 = 4.81in^2
The trick would be to make the exhaust similar to this one.
The difference would be after this point
the pipes would come together and go into the 3.5" or 4" pipe seperately. They would then go over the axle in the split pipe only to be split apart again once over the axle into 2.5" or 3" pipe to go to mufflers.
The concept is that the exhaust stays seperate like a true dual system but passes over the axle like the stock system. I'm sure it wouldn't be too hard to cut a Mufflex over the axle 3.5" or 4" pipe down the middle, weld a plate to close in one half to make a D shaped pipe, then weld the pipe completely back together like CD. There would have to be some more custom work where the 2.5" or 3" pipe entered and exited this fabbed split pipe, but I don't think it would be too hard for a decent exhaust shop or do it yourselfer.
A flowmaster y-pipe like this could be used if you cut it apart and put a divider between the 2 pipes as they merge into the one pipe.
The idea solves the ground clearance problems for duals, the problem of getting two pipes over the axle in mandrel bent form, and some of the cost issue since the over the axle pipe is already bent properly.
Last edited by FAST LS1; Apr 15, 2004 at 03:17 AM.
I'm sure one of the cat-back manufacturers could make an over the axle pipe with the dual pipes already fitted on either end. It would make custom duals over the axle pretty easy then since a muffler shop could do the x-pipe, mufflers and tips out the back.
if you could find some oval pipe that might tuck higher and might be a little easier to route, prolly not cheaper but then again i had mine done at a local shop for $175 with 3in pipe dumped, so i think i got out pretty darn cheap
