We're not at BMW N54 power levels, but its not bad for two less cylinders! Ingredients: 2008 Evo X GSR, Ultimate Racing full TBE w/ O2 housing and upper intercooler pipe, K&N drop in, GST boost assembly, and Dyno4mance tuned Ecuflash mapping. Red graph is all, blue is stock CBE, heaps quieter, but crazy resonance at high RPM from flapper valve. Need to get that rectified so I have a quieter solution. As you can see, the power difference is nominal.
Images of the car:
