Here is the results of the 1st testrun with the X-pipe
No tuning changes were made so that we could see what the cause and effects of the exhaust change was

Engine leaned up about 5% more so assume better exhaust flow and you notice at idle (cell 19) was way more leaner so the X-pipe allowed this engine makeup to move out the exhaust better in cylinders.

Rearwheel gains look to be about 10/10 HP/Tq and shows the claims some vendors make of 30 HP is bogus.

Gutted CATs Left graph - Xpipe Right side