Can you expand on the 2" off off the manifolds
Did you buy the pieces that bolt to the manifold from Summit? Have a part #?
Short answer: No, an exhaust shop crimped in the donut flange.
Long answer: Sure I'll expand...but it's a bit of a sore subject. I did a little research and couldn't find any aftermarket "starter" pieces. I did however see these, which looked promising and is basically what I planned on making.
http://www.travelallparts.com/products/photos/ExhauseDonuts_225670.jpg
The plan was to cut the flare off an existing exhaust pipe, then bore it out for a slip fit over a 2" OD pipe.
Then in the interest of saving time, I stopped by an exhaust shop so see if their machine could do a factory style donut flange. The guy said yeah yeah, no problem. Appearantly I wasn't completely clear on what I wanted as he produced a couple pieces that flared the tube, then pressed in a smaller tube to create the donut flange. This of course restricts the ID to that of the pressed in pipe. I wasn't real thrilled about it, but forked over $30 for something I didn't want. Ultimately, I don't think it was really that big of deal it was still large enough to flow all that my motor would need.
By the time I drove the couple miles home, I was back to plan A. Make my own. Having that little restriction right at the manifold would have ate at me, knowing it wasn't right. It was a bit time consuming, but I produced one of my own. I think it would have worked fine, but I was out of time for that weekend so I didn't proceed.
You can see several pics of the ones I had made by a shop, and the process of making my own here.
http://www.broncoii4x4.com/donut-flange/donut-flange.php
Then I ran across a photo on Pirate4x4 of guy that made his own exhaust, which had factory a factory style donut flange crimped in the tube. He told me in a PM that he just had his local exhaust shop do it.
http://www.pirate4x4.com/forum/showpost.php?p=3909526&postcount=44
Now that I knew it could be done, I was back to plan B...find a shop with a machine that could do it right!
Since I travel the whole region for work, armed with the picture of what I wanted, I stopped by several exhaust shops. My travels brought me to Stans Headers in Auburn, Wa. For the first time, the guy instantly knew what I was talking about. He said he hadn't had a request for that in a long time. Unfortunately it was going to set me back $18 ea. Highway robbery in my book, but understandable being that they are a header shop and their time is valuable. So like 2 minutes later it was done. I even got to watch. It's just a stupid piece they throw on a standard exhaust machine and voila. I'm quite certain now that some of the other shops could do it, they just didn't know it.
I did get a tour of the header shop, so it wasn't a total rip off. They had several Mandrel benders, so that was kinda cool to see.
So my advice is to check out some of your local exhaust shops. Chances are one of them can do it, and probably for a lot less than I paid. I wouldn't bother with the midas type shops though.
To clarify, I used 2.00" OD pipe off the manifolds, which merge into a single 2.25 OD pipe.