When I started looking at what pipe to buy, I had called Mark and asked what he thought I should run. I told him my setup and what fuel I'll be running. KB SS and nothing above 40% nitro - maybe just 25% most the time, so he suggested I get the standard (original) pipe. He built the larger HP pipe for high nitro, and come to think about it he did mention some of the guys were having trouble with the original with high nitro, so thats why he started with the HP.

I decided not to get crazy with buying nitro, so I chose the original pipe and just left buying the HP for when I do decide to jump up over 40%.

They almost look the same, except if you go to the website there is a slight difference...

The original is more slender on the secondary cone, look close at the outside curve of the weld. The HP seems more stubby at the second cone, maybe more wider.

If you want to compare pipes, heres what kind of eyeball measurements I have with the pipe standing up straight as I can put it on the bend:

It is 6" to the root of the stinger tube, and 2 5/8" to the top of the inlet tube. I'm almost sure he would use a welding jig to hold the parts, so they should be pretty close to each other.

I used my calipers to measure the fattest part of the pipe before it flares into its welding lip and its about 1 3/8" wide, and across the two halves its 1.300" thick.

If you can, measure your's up and post it because I would like to make sure mine is what was sent, not the HP. It's too hard to verify what I have with just the webshots.