I have 2 of the same and so far I have done the Solas 12/20 impeller and wear ring, I ordered the Riva intake and cant wait to get it on, and I did a 3 Degree wedge on both as well and I feel like it plains faster without hitting rev limiter as much on take off, seems to be good so far. I found that non ethanol fuel has been the best results so far unless it was just bad gas from when I bought them. I am replying here because I want to know the same thing. Also wondering about exhaust upgrades and some feedback on the x charger and 42lb injectors would be nice and whether the intercooler form the 215 would fit our 185s.