Has anyone tried to remove the catalyzer material in the stock pipes? How much weight is there? I'm thinking about doing some carefull hacking of my stock system.

Let me know how it goes...You may want to snatch a stock system on sale cheap to do ur demo work. I think there were a few 4 sale here...

Obviously a real system is preferred but since I'm installing a PCV and autotune, there ought to be some improvement in exhaust velocity to be gained by removing that crap. Shortening the cans a bit and repacking should also shave some weight and change the tone a bit. Getting a back-up is a good idea though.

Well, as it turns out I just need a 06-07 header which is cat-less. Problem solved.

New development - 08 header, the outlets are larger diameter than earlier models making midpipes different. If someone can confirm this that'd be great. Otherwise I'm gonna follow this write-up.
Your text to link here...

New development - 08 header, the outlets are larger diameter than earlier models making midpipes different. If someone can confirm this that'd be great

Confirmed. If you use an '06-'07 header you will also need the stock cans and midpipes or a pair of S/O's specifically for an '06-'07.

I'm going to flow out the pipe no cat = Shebing.

I'm going to watch a cat pipe flow untouched = Shebing.

I'm looking at the early pipe w/out cat and the diameter is equal in flow to a cat don't chew know?

I'm looking at you now and did you gut the cat from a larger diameter pipe and the flow now fills the pipe it more slows down the flow you cooled the pipe pissing out = Shebangs!

I'm, I'm missing some grunt hear... How do I reinstall my cat sup witch choose messing with the engineering ear we go same ass flow don't you know?

I'm a gen1/gen2/gen3/slip me on if I'm a gen4.

I'm an O/D gasket is the same size fits any gen muffler end who said gen?

I was thinking the same thing, Hub. Looks like I can spend money, or I can make things complicated... and spend money. lol I usually do the latter. That's just how I roll.