Modded XB12 Exhaust

[jonzin]

I have half a donut left after my mod. $25 plus shipping?

 

[BRatigan]

I've got one left too. Same deal here. Remember the VooDoo exhaust, which I thought was really freakin cool uses the same bend in its design, only I think it was a front exit design.

BR

 

[BRatigan]

Yep Jon0341, I will be looking to do that pretty soon. I have zero experience with dyno runs so like everything else in my life I will have to learn fast.
There are a couple of dynos in the area from what I am told. Do Hardley Dealerships have dynos?

BR

 

[Midnight82]

Do Hardley Dealerships have dynos?

Some do, they're expensive to buy, so not all have them.

 

[dave_xb12r]

I'll give one of you $25 if it's shipped.

 

[tuneport67ss]

Not to bust any ones bubble or steal a sale from anyone but i just wanted to let you guys know that summit racing has j- pipes in all different sizes. I ordered a 2" for my custom pipe. It has a 3" radius and one has 6" of pipe and the other has 14" of pipe I paid $23 shipped and got it the next day. Just wanted to give all you guys a different option.

 

[tuneport67ss]

Also, if one of you guys will give the center to center measurement on the out side pipes from one to the other, I will check the j-pipe I mentioned earlier and it might be what is needed to do this mod with out the need to stack the pipes. Just an offer and idea.

 

[jonzin]

I still have the internals and I will get the measurement as soon as I can get my son out of the pool.

 

[jonzin]

Also, if one of you guys will give the center to center measurement on the out side pipes from one to the other, I will check the j-pipe I mentioned earlier and it might be what is needed to do this mod with out the need to stack the pipes. Just an offer and idea.

4.75"

 

[jonzin]

Here is a rough sketch looking from the back to the front of the muffler.

 

[bajabomber87]

Not to bust any ones bubble or steal a sale from anyone but i just wanted to let you guys know that summit racing has j- pipes in all different sizes. I ordered a 2" for my custom pipe. It has a 3" radius and one has 6" of pipe and the other has 14" of pipe I paid $23 shipped and got it the next day. Just wanted to give all you guys a different option.

They don't fit inside the can without cutting them in the middle and rewelding them back together. The only one that fits perfectly is the 2'' radius 180* but its a 1 3/4'' o.d. tube, not 2''.

 

[BRatigan]

My design utilizes the donut which has a 2 inch radius and 2 inch diameter pipe. 4 inches centerline to centerline and 6 inches outside overall diameter. This bend is tough to make on a bending jig so the donuts are pressed and die cut for each half and then welded together on the outside. A smaller diameter will of course work but I was trying for as much volume and expansion inside the stock can as possible. You can see here it just fits inside the can.

BR

 

[tuneport67ss]

This might help some one out too.
Summit Racing J-Pipe

Just thowing out options. I like the idea behind this mod.

 

[BRatigan]

That pipe may work even though its reduced a little in diameter. The reason I used the pieces I did use was so I had the ability to wiggle the bend up high to clear the exit pipe. I even thought of doing a custom welded offset for the exit pipe but I chose the path of least resistance. It did involve more welding as all the seams needed to be welded. I will post my interior pipes from the side view tonight. I am not proud of my semi bird poop welds but they did seal.
It will show how I had to bend/adjust things so this would work.

BR

 

[Midnight82]

I am not proud of my semi bird poop welds but they did seal

You did better than I would have. Last time I welded it looked like I was hanging grapes.

 

[tuneport67ss]

Last time I welded it looked like I was hanging grapes.

I can say I havent heard a weld called that yet.

 

[BRatigan]

Ok, here is the sideview to show that you can adjust upward the loop and tilt lower the exit pipe. Sorry for the welds, I like low pressure gas for light guage stuff. I suck at mig. This setup, with 2 inch pipe as the biggest diameter, is what fits comfortable in the stock shell. Oval pipe would also be interesting. Anyway... thanks to everyone for their input and feedback.

BR

 

[jonzin]

Here are some pictures of my modified exhaust. Mine is very similar to BRatigan's except I added dual exits.

My DAD helping out.

Insides

Freshly painted.

Video taken with my Motoraola DROID

 

[BRatigan]

I like it Chance, I will switch mine at the end of the season and do a double exit, has a muscle car hint at idle.

BR