new exhaust port gaskets ? bikes only has 100 miles on it. looks like it might be tough with the lowers in the way.

 

Then don't change them. If you install the pipes correctly there shouldn't be a problem. I've changed my headers at 40,000 miles without leaks.

 

I would think that if you can pull the old exhaust headers off, you should have enough room to install the front gasket, if not pull the right lower.