I am not sure that the ESP would be affected as long as the rolling circumference of the tyre/wheel package is the same, the offset is similar and the wheels are a similar width, ie 8". The tyres would need to be 235/35 x 19" on a 19" x 8" rim with an offset about ET44 or there abouts. A 235/35 x 19" tyre is approx the same as a 235/40 x 18 which are standard. A 235/35 x 19 rim/tyre package would take up no more room under the guard as the overall diameter and width of the package is the same, so there shouldn't be a suspension scrub issue. Unless someone can point out some other reason for not using 19" rims.
The R32 V6 Passat comes standard with 235/45 x 17 rims and you can upspec them to 235/40 x 18, albeit with the lowered suspension, and this doesn't affect the ESP. Again, the 235/45 x 17 rim/wheel package has the same width and diameter as the 235/40 x 18 package.
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