Reneir, There are at least two flavors of turbine scrolls for the K26 that were fitted to audi's. The earlier cars all had 56 mm exducer, while later cars (mostly the water cooled turbos) got a smaller 50 mm exducer. The K-24 by contrast is a 46 mm exducer. So yes, you many be able to move the boost down, depending upon what youve got already. paul timmerman