Hybrid rs6 turbos capable of over 500whp on 91oct to 600+whp on e85/race. Wheel sizes stamped on housing. These are larger than other RS6 hybrid turbos and have billet compressor wheels, meaning they are stronger and lighter increasing longevity. All turbos carry a 30 day unused return policy a 20% restocking fee will be applied upon receiving turbos in new condition unused.