I am currently running the SLP pipes with Brads plate and I didn't have to do any mods...until I went with the stock airbox setup, then I had to fit the pipes to clear the underhood air plenum. I got a used set on here, but I may have gotten 797 twins and I have to do more testing to figure it out for sure.
In the next two weeks, if my sled still won't pull 8200, then I am going to get a new set of SLP pipes just because I can get them for a reasonable price now.
I have been meaning to post some pics, but my sled is apart right now...