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The GT525R is base on stock turbos, rebored, new CHRA with larger turbine and compressor. 4-bolt and thrust bearings (360°, stock is 270°). You can compare them to the Sport 500. The Sport 530 are based on Garrett's new generation ball bearing turbos, 5-bolt. They are the GT2554R. You can compare them to Z1's GT600R which is a GT2560R.
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