I have no affiliation with these people, but you might want to have a look at www.performancedubai.com as they have a few ideas on keeping the under bonnet temperatures down. I was somewhat interested in the exhaust wrap.

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1993 190E 2.0L (Euro.) sold
1991. 500 SEL (Euro.)
1991. 300 CE (Euro.) sold
1993. 500 E (U.S. spec.)