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Future NOx emissions limits are very difficult to meet with conventional high pressure EGR loop. This limitation causes diesel engine manufacturers to give much more attention to low pressure EGR systems. This configuration enables higher EGR flow rates and therefore lower NOx emissions at the same engine operation conditions. The implementation of low pressure loop ensures sufficient driving pressure for the EGR flow rate however conventional compressors are not specifically designed to endure the fouling of Diesel exhausts. An improved version known as clean low pressure loop takes the EGR source downstream of the diesel particulate filter keeping the compressor free of soot. The performance of the compressor improves substantially but it is necessary to protect it from eventual ceramic particles that can be discarded from the DPF.