I looked at the Neuspeed P-flo, but decided against in favour of the EVOM's. There were a few reasons.....
1. There is no separation of the filter from the engine bay area with the P-flo, but the EVOM's has an extra shield.
2. The P-flo mounts onto the engine block using an unused bracket that can and does tend to break, then there is nowhere to fix the P-flo to.
3. EVOM's had shown positive gains, yet I hadn't seen any proven gains from the P-flo at the time (still haven't)