Well as you know Kev, your .48 housing is best for quick spool up, a .63 will give you more topend but will be marginally lagier,,,,


My T38 has a .63 on it, it's quite laggy but it pulls all the way to 7 grand, i was going to go GT30 but i'm staying with this until it blows.. Karl is mapping it for me in 4 weeks time i've got a L8 and a set of 1000cc to go on and it's going to be about 2.1 bar....