I can't fault mine, the boost come in earlier enough and doesn't drop off - mine was running all over the place at the last RR and made 398. I've since changed to 55Ib, 4x4 inlet with 17mm spacer, air injectors and cometic gaskets as the others had blown around the inlet which i think played a part in the lower power figure so hoping this time with more boost (maybe 35-36) it'll be better