As Stevo says, it's not really necessary save for really cold starts. If you wish to replace it bring a piece of the existing pipe to a good motor factor and they sholud be able to sell you a length of it to suit your car.
As regards your fuel economy...what parts did they replace? Did they use original Volvo parts?
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Liam...
'96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav.
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