HDi Engines

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The major physical difference between the HDi 90 (bhp) and 110 (bhp) engines is the latter's intercooler. But as this is a full-width type, mounted behind the radiator, the immediately obvious difference on opening the bonnet is the 110s air pipe to the turbo as shown in falling-out-with-my-car's photo (right)

As a check that someone hasn't just grafted an intercooler and pipes onto an HDi90, 110s have RHZ in the VIN, whereas 90s are RHY.

HDi engines in C5s look similar but the 110 has its intercooler mounted beside the radiator, on the left.