I couldnt resist it and had to e-mail him lol.
I asked how his J-spec turbos managed to hold 1.5 bar boost at 500bhp and if his stopping was scary with the stock brakes lol.His reply was...........
"hi m8 its running at 1.0 bar but can be increased to as much as 1.5 but is very uncontrollable. the power is able because of the tial external wastegate modification. It allows the turbos to work so much easier because it releases the pressure on the turbos when gets up to high boost and allows the turbos to do loads more but at the same time running very comfortably as the pressure just isnt against the turbos. and also in exaust just below the first cat there is a bottle neck. We gradually changed the shape by cutting the bottle neck away. now the biggest problem with this is that once you do that you get uncontrollable boost in 4th 5th and 6th which many modification companys say is a no no as its too hard to get the boost back to a controllable level. but the tunner i had doing it says he knew a way to control it and it worked
I got this guy from sri lanka whos my tunner who used to work in toyota japan and was very high up until eventually getting a new job making programmes for the ECU's of the renault f1 team then he came to the uk and that's when i met him. he is more than happy to talk with you about any of this let me know if you want more info"
All i can say is " WTF " is talking about lol