Installed my HP650s last week. What a riot! My 1M felt so fast! Went to a track day at Zhuhai International Circuit. Posted a time of 1:50.6. Only car faster than me that day was a 991.1 GT3.
I rigged up a temporary solution for the outlet. I started with a PSP outlet for MMP stage 3. The Y portion fits to connect to the front outlet as well as intercooler. I had to cut part of the Y where it goes to the rear outlet as it rubs the frame rail. I slipped on a bendable silicone pipe to the Y, then a short piece of straight aluminum with beads to connect the silicone pipe to a 90' elbow which slipped onto the rear outlet. It wasn't ideal but it worked. Maybe wrapping gold foil on the whole system helped
I could feel the HP650 turbos make more power up top. Indeed, the car pulls so strong to 7,200 rpm. I have logs and Virtual Dyno, but I won't share the dyno until I get on a real one since the accuracy for Virtual Dyno is debatable and posting that result causes more chaos than it would help everyone understand how good the turbos are. With turbos and outlet the only things changed, compared to stock turbos, the torque curve doesn't necessarily shift up, but it does shift to the right to higher rpm and it stays flatter near the redline. Using tune Version 1, my car did over-boost in 3rd or 4th gear under partial throttle, but it appears Omar fixed that in tune version 2. I have PR stage 2 LPHP. It never caused EKP over heat issue before but I got that this weekend. So it seems like an EOS EKP upgrade must be ordered.
Only small complaint is that compared to stock turbos, the spool is slower. In a few slow corners i used to do 3rd accelerating from about 3,000rpm, now I have to drop to 2nd.
Great turbos from Omar and good tune as well.