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Not sure if this has been posted before, but it's certainly worth a comment - for diesel owners at least! I've just had my indy mechanic fit an Over-running Alternator Pulley (INA 535 0223 10) that I purchased online from SparePartsStore24 (GBP43.53 incl shipping) ... it had to be delivered from Berlin taking 6 days from order to delivery. Replaced the auxiliary/serpentine belt as well. The reduction in tick-over noise is immediately noticeable, she is now purring like a kitten rather than rattling like a tractor! The 'OAP' fits both the Visteon and the Bosch alternator using the appropriate spacers that are part of the kit ... 3mm (Visteon) and 1.4mm (Bosch). Apparently there is also a tensioner/pulley modification that, some have said, further softens the noise. This I shall consider at a later date.

Went down to spires Jaguar yesterday and had a stage 2 exhaust fitted ,WOW my car sounds like a proper V8 now ,what a change,the exhaust keeps the cruising silence ,but when you toe it boy does she sing. Mat is a great bloke knows his stuff,i would highly recommend

Went to spires yesterday had a stage 2 exhaust fitted ,great place what a difference exhaust has made ,it sounds like a v8 now ,without being intrusive,would highly recommend spires,Mat is a great guy and he knows his stuff.

That's an interesting article Trevor, thank you. It gives much more detailed information than that which decided me to fit the OAP in the first place. It would now seem that I've inadvertently improved the efficiency and lengthened the durability of many other component parts as well as initiating noise reduction. WIN-WIN!