If you're interested in upgrading a turbo, whether it be a good working order one or knackered used one I can offer a complete rebuild and hybrid service, All machining, porting, rebuild and balance work is carried on the turbos. I can make a hybrid to suit you and at a sensible price.
An example of my work.
K04 Hybrid turbo for the Audi S3/TT
Started as a K04-022
210bhp
Modifications
Machined exhaust housing to accommodate the larger RS6 turbine
Fully ported Wastegate to decrease boost creep
Machined K04 compressor housing to accommodate larger 2283 RS6 Billett compressor wheel
Rebuilt using complete rebuild kit
Fully 2 plain balanced with in 3 time OE specs
Upgraded T rear oil seal for high boost applications
potential with supporting Mods 340Bhp
Suggested 300-320bhp