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hahn 20g vs 25g

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its a baby step up. IMO not worth the upgrade if your looking for substantially more power, and or efficiency.
 
The 25g compressor wheel is 60.5mm x 78mm and the turbine that you should use is the tdo6h4 58.8mm x 67.2mm. The gt35r compressor is 61.4mm x 82mm, if that gives you an idea how big that turbo is.

The 20g is 52.6mm x 68mm on the compressor wheel and can be paired with a tdo5h 49mm x 55mm, tdo6 55mm x 65mm, or tdo6h 58.8mm x 67.2mm turbine. The 20g would spool much faster, the 25g would be a lag monster.

The 25g would work well for a stroker motor, and adding a larger throttle body helps pick up spool with a larger turbo like that.
 
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