However, in 2001 Proton replaced the Mitsubishi EFi module with Siemens VDO module that is claimed to cause slight power loss.
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Its cars are very popular among Malaysians, such as the Perodua Myvi, which sold 80,327 units in 2006, outselling its rival's best selling car, the Proton Wira then, which only sold 28,886 units in Malaysia.