I was reading the instuctions for tuning a pipe on the Macs Products website. http://www.macspro.com/tuning.asp

It talks about shortening the header in 1/4 inch increments until you reach peak RPM, which is determined when you start to see a drop off in RPM. What I would like to know is, if your application will require require a length of silicon tubing between the header and pipe, How does this affect the overall tuning? In my case I plan on a Supertiger G90 in a CG Ultimate with the pipe inside the Fus.

Thanks for your thoughts and experiance.