The stock Tee is horrible and causes both turbos to pull air from the same space.....basically they are both fighting for the air. Completely separating the two sides allows the turbos to suck much more freely. What was really cool about this test is that it shows what getting rid of the tee does because it is able to use the exact same ECU program :-) When you change chips and tunes you always wonder if the tune is better on a different program. This clearly shows the benefit of getting rid of the stock single filter tee and takes the possibility of the results being tainted out of the equation. Breather mods are my favorite! Dual pops, larger intercoolers and pipes, expansion downpipes, cams.....All have amazing results from less restriction.
