Well i'm lookin into a 57 trim upgrade. The shop i'm lookin at has it priced about $300 with garret GT compressor capable of 520-620HP. If the turbo needs a rebuild then its $650.00. And if you want the compressor and turbine and rebuild option it runs $975.00 and supports up to 720HP. Now do these seem like good numbers to you all who have had this done or no???