tbalam wrote on 12/31/69 at 16:00:04:


Man, I am proud of you!!!  I wondered if someone would take that and run with it.

I had thought about cutting it out of the stock header but I  had someone that "said" they wanted to buy it.

Anyway, you just increased your exhaust output...and still have the double wall so it won't turn blue.

Why don't you explain how you did it, and claim title to your first original performance mod...

Ok here we go.

I don't have access to a dremel, would have been way easier if I did.  I used a 3" cut off wheel on my cordless drill. It took a lot of recharges, thank god for two batteries.

First, I took a hacksaw blade with one of those small handles, and cut the reducer ring.
I cut down the cutoff wheel, using a pair of wire cutters to a little over an 1.5", so that it would just pass through the opening. I used a socket that fit through the exhaust opening to find the right size then trimmed the wheel to fit the OD of the socket. On high speed I ran the cutoff wheel around on the inside grinding off a layer metal. I rotated the drill to changed the angle of the grinding wheel continuously, while grinding. Similar to what you do with a drill bit to enlarge a hole. It works very smoothly due to the shape of the inside of the pipe. After 4 wheels I started to see the weld line. Once I had the line about an inch long, I took a hammer and old screw driver and broke it loose, along the afore mention hacksaw cut. I continued grinding and breaking it loose as I went. After I saw the first weldline  it took about an hour, again with proper tools one could do this in significantly less time.

The nice thing about the cuttoff wheel is that it gave a nice smooth finish and shape to the inside of the header pipe after it was done. Removed all the burrs and such. For whatever reason the reducer ring has a ridge in it that extends the length of the ring. See Greg's post at the above link he mentions a little knob weld on the side.

When in doubt cut the reducer ring farther inside so that you don't cut the double wall, you can always shape it afterwards.

That's great....this is a first and a second...

Don't believe that I ever heard of anyone using a hacksaw blade to cut a cutoff wheel.

Once again.  Salute!
8)

tbalam wrote on 12/31/69 at 16:00:04:


Naw...leave it.  The clarification makes it even better.

Wire cutters to cut a cutoff wheel....

If you have any of that wheel left, it just might fit in your intake port too

I only noticed an improvement throughout, but it is all subjective, and might be because I WANTED to feel a difference.

I keep making changes & afterwards I realize I hadnt actualy timed the thing so I could measure the change, good or bad. & I too realize I WANT to see a positive change, so may well be in the process of giving myself colo-rectal cancer, by blowing smoke up my own Bu##.. Are my eyes a smoky color yet? I guess if cutting it out is a mistake we can stick it back in. I know a good welder. Maybe, if I mess up the stock header, it would be a good time to get a single walled one & go play.. just sayin, maybe,

Congratulations Tbalam, Ther have been some serious new groundbreaking mods recently, mighty cool..

wellthenImgonnadoit! Might do it tomorrow,,