So ive been trying to do things to increase top speed and power in the 350. When I got the car it barely did 95mph downhill. I cleaned the air intake manifold, lines to the ALDA and unhooked the EGR and now im able to hit 115mph on a straight. I want to get more power and speed still. I unhooked the vacuum line to the wastegate today. Before hand the boost was max of 0.9bar now I am getting all the way up to 1.5bar. However the strange thing was when the boost started getting higher towards 1.7bar the needle started twitching back and forth and as I got to higher speed it felt like the turbo kicked in and out? Anybody have some good ideas what I can do?