I did a compression test before the GC 2.0s were installed and these were my results for those who are interested. I used my OTC 5606 Compression Tester Kit for these results and the results that I got passed the test. The n54 engine in my car runs great, and there are no issues that I've come accross yet inregards to the engine. The Race intercooler was a perfect match for the GC 2.0s and keeps the air temps down very well.
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2015 BMW M4 F83
2009 335i X-Drive | GC 2.0 Turbos (sold)
2009 335i e93 (Sold)
2007 Bmw X5 (Sold)
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