I did the install myself, I did use gasketcinch but I wasnít that sloppy. But I actually think I found the cause. I was looking at pictures from a year and half ago and found a picture with the exact same stain pattern, just not as dark.
So I think it probably is excess sealer like you suggested or residual cutting oil from the manufacturing process. The stainís probably gotten darker as a result of repeated heat cycles. Iím just going to try and scrub it off with something thatís not to abrasive and then keep an eye on it after. I shouldíve given the lower intake a good scrubbing before the install.
In terms of the fuel crossover line, the whipple instructions for the 08-10 models actually say to do it that way (picture from manual):
I have no idea why that is, I remember checking the manual and online at least a dozen times to see if that was correct, as I hadnít actually seen a whippled 08-10 model before the install. Since then Iíve read about people with 08-10 models just buying a longer fuel hose and routing it around the back like was done on the earlier models; which is what I wouldíve done in retrospect. I get asked about it all the time.
Maybe whipple provided a shorter crossover line for the 08-10 models to save a few bucks on fuel hoses? Haha
But seriously 2008-2010 was pretty much the peak of the recession. I got a stapled black and white instruction manual that looked like it was photocopied at the local library with my kit. Whereas my buddy with an 06 got a nice color manual in a binder with his kit. My kit seemed a little more basic in terms of packaging and overall finish compared to his. But I sincerely doubt that the reason for having a shorter fuel hose routed over the compressor, thereís got to be some reason for it.