As Yamanube mentioned, it can and is a lot of grinding, been riding that setup for 5 years. I have another with a 144 Pump and tunnel grafted that seems to pull better and utilizes a SJ driveshaft, something to consider with limited availability of FX1 shafts, also utilizes SJ intake grate.
Next FX1 project is going to have the Kawi 140 setup though, eliminates the mid shaft hassle. Had one I got from th mafia and it pulled very good. IMO unless you’re in the surf don’t bother (opinion)!