
Originally Posted by
Yorkshire_Jon
In the real world... nothing!
If theres nothing wrong with your existing rubbers, leave them as they are. If they are knackered, replace them with either genuine rubber or silicone depending on local cost.
Sure the silicone stuff is less prone to the effect of oil and there is an argument to say that they can give you a performance gain. But in reality that performance gain comes not from the silicone hose, but from the fact that OLD rubber is more fatigued and so will balloon more than a new silicone/ new rubber. Also, on the older Tdi engines the one of the solid pipes had a restriction in it, the performance boys "silicone kits" replaced this with a straight through pipe. All very small gains that add upto a benefit, but in reality not really noticable when sat behind the wheel.
Regards,
Jon
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