R32 GTSTT

Hi guys, After blowing a turbo gasket, I’m in the process of fitting 2 stock RB20 turbos to my Nissan Syline R32 GTSt. All the work is been done at a engineering firm in Bunbury WA where my dad works. We are making 2 separate manifolds one for each turbo. Front 3 exhaust outlets to one and the back 3 to the other turbo. There is going to be a balance pipe that goes between both manifolds to equalise pressure into both turbos. We see there is no need to have 2 wastegates so one will be blocked off. All water and oil lines are been ‘T’ . There will be 3” pipes coming off the back of the turbos converging into a 4” exhaust system. Air intake for the turbos will consist on the 1 pod filter, splitting into 2 pipes after the afm then to the turbos. The outlets for the turbos will converge into one tube entering the front mount intercooler then engine. This project is well underway, and if all goes well will be completed in a month. Before starting this project I had 200bhp running a stock turbo with 13psi, with the intercooler and a 3” exhaust. I have had it down the drag strip with a time of 13.7 @ 167km/h. I was interested if any one had any comments on how laggy it will be, the power output I might achieve, or any concerns about what im doing. All comments will be appreciated. thanks, Ewan.