@ just finished installing the Motiv OP and FP.
First impressions on Cold Start, not any different whatsoever than having a double resonated FP.
Did find this on the OP to header connection. Gasket was FUBAR. Grimspeed one too, I thought it was just me going crazy on hearing a slight leak all this time.
I did have some slight fitment issues. The bolts supplied are 14mm, the nuts are 15mm. Which seem to be the self locking ones. The problem I was having is that I was tightening the nuts, not the bolt, so I had leaks everywhere. Once I thought about tightening the 14mm bolts, I realized how much more tightening I had to do. All good now. Noob moment.
Going to take it for a spin and report shortly.