The W123 looks nicer and it's probably more reliable. I've seen the CDI in person and sat in it at a dealer with the motor running. It was ok but nowhere near as appealing to me as a W123. Just my 2 cents.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL