i think theres no comparison!
2nd gen lp still uses the restrictive fuel lines and filter
but im not bashing it many people have success with it
but
the air dog or fass are all 1/2 inch lines!!
better filtering
im working on a fuel system upgrade myself!!
good luck
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90 w250 4 inch pipe ,he351cw, pump mods, 727, 1400stall tc, full 1/2 inch fuel system dual filters 100gph electric pump to the ip, full 3" crossover tube
soon to come: ddp4s next week, home built w/m setup soon