Have a car Im asking about for a friend ,the engine has no intake and turbo currently,if compression is done without the missing parts will it affect the test?He bought my 300sd and hauled it back to Austin ,I tested the compression before ne came up to get in july,car was running fine ,he know claims its only testing 230ish on some of the cylinders ,he pulled the intake and turbo off and not sure if it makes any difference during test.Could it be something else he pulled off?