I run an attitude industries box with a regulator to run Jaws Twinns on My 09 M1000, On my 07 M1000 with the same Box settings and Pipes, I did not need the regulator. I needed it to clean up the Midrange, on my 09 with the midrange setting on the box all the way backed out, it was still really boggy and would not run right, dropped about 3 Psi and it went away.