Boost solenoid is on passenger side of engine half way to the back of the engine beyween the block and aie intake hose. Its held on by 10mm bolt with 2( 7mm) hoses going into it. Hope tjis helps. Theres a pic somewhere on here that shows it
Personally I like it. Do have the odd boost fluctuation within 0.8 psi I have found. Have dual stage settings with push button selection. Bought it due to my issues with stock boost solanoid that was playing up and this fixed it.
Had my varex muffler installed yesterday along with dump pipe back 3 inch 100cell cat. When open fark these things are loud compaired to my old 2jz gte aristo.