the reason boost drops off is because thw turbos cant flow enough volume to make that power at 18psi at high rpm Stock turbos are absolutely maxed out at that power level
Ok heres where the whole 300rwkw thing on stock turbos needs to be straightened out. You WILL NOT make that much power on 98octane, end of story. I personally believe it can be done on E85 as there are two or three cars in the US running low 11's at 120+MPH on stockers but the turbos are maxed out completely, 24PSI in the midrange and then drops to 17PSI by redline.
Power is depends on dyno and car condition. Im using two shops dyno and around 30kw different. And I was tune two 180sx and both almost same mods and boost then same dyno also tune by me but 30kw different. This is my face book and both dyno sheet uploaded. www.facebook.com/toshi.tune.3 FMIC is easy for make power on dyno. Because if shop do not have two dyno fan two SMIC can not cool down.
update another black zed on the road current Mods HKS side mount intercoolers Greedy prospec 2 boost controller (big thanks to George ) BMC pod filter UAS alloy intercooler and intake pipes Coil overs waiting on the list 740 cc jecs injectors nistune anybody looking to sell nistune ecu , or 800cc + injectors pm me http://s21.postimg.org/bephxeksn/IMG_0384.jpg [img=http://s21.postimg.org/yg6335kg3/IMG_0384.jpg] http://s7.postimg.org/6oao7d18r/IMG_0394.jpg [img=http://s7.postimg.org/7qkupwk1z/IMG_0394.jpg] http://s12.postimg.org/h3pfjq3b1/IMG_0386.jpg [img=http://s12.postimg.org/mrvqam7nd/IMG_0386.jpg]