I liked 181 dv's with 3k gsk, 0 plate, 300 inj. , adjustable elbow set at 39 to 40 psi , the napa 2790 (i believe thats the part #) air filter, lightest spring in the afc housing. in fact i didnot feel that much difference between this setup compared to my now 191 dv's with 370 inj . and a number #6 plate. just a lot more smoke. then again i haven't put on the hx40 yet.