Stage 1 features:

improved bearing system helps hold heavy loads where standart bearings would fail;
new billet compressor wheel. This enlarged impeller with improved design helps achieve wanted boost easier. Due to its better material and special production processes it is more reliable when used under high pressure;
upgraded turbine wheel with shaft from stronger material and improved design. Enlarged base provides better flow;
machined and fully refurbished housings;
every rotating part of the turbocharger balanced, after full assembly turbocharger is ballanced on VSR;
Power range: 550 HP

Stage 2 features:

standart bearings replaced with dual ceramic ball bearing systems. It helps turbocharger spool better and allows to reach results faster.
new billet compressor wheel. This enlarged impeller with improved design helps achieve wanted boost easier. Due to its better material and special production processes it is more reliable when used under high pressure;
upgraded turbine wheel with shaft from stronger material and improved design. Enlarged base provides better flow;
machined and fully refurbished housings;
every rotating part of the turbocharger balanced, after full assembly turbocharger is ballanced on VSR;
Stage 2 power range: 600+ HP

.

upgrade turbocharger for BMW N55 features:

improved bearing system that helps to hold heavy loads;
new billet compressor wheel. This enlarged impeller with improved design helps achieve wanted boost easier. Due to its better material and special production processes it is more reliable when used under high pressure;
upgraded turbine wheel with shaft from stronger material and improved design. Enlarged base provides better flow;
machined and fully refurbished housings;
every rotating part of the turbocharger balanced, after full assembly turbocharger is ballanced on VSR