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bayliss said:
so a panel filter's good. what about some top notch plugs and leads do? anything? what about increasing the amount of cold air into the airfilter do? (be means of rediverting with larger dia tubing to a vent)
what does a PBValve do anyway??
are all of these mods going to be that cruel to my mpg?
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Filter, air feed, plugs and leads will offer very minimal gains, a few bhp only. I take it by PB Valve you are talking about the Powerboost valve which sits in the fuel line? If so then it basically replaces the standard FPR (Fuel pressure regulator) and increases fuel pressure to the injectors, which all it really does as far as I am concerned is offer better fuel atomisation (Spray), so offering a slight gain in performance and a cleaner fuel burn. Before considering this you may want to take into account that the A4 FPR is rated 1 bar higher than the A3 version, so would probably acheive the same as the PBV.
None of the mods you've listed will adversely effect fuel ecconomy, if anything they should improve it, not that you'll notice. Allowing air to flow more freely, through the use of a performance filter and a larger air feed will only help, added to taht if the air is cooler it will also help.
But really the gains on a 1.6 are so minimal you have to ask yourself if it's really worth it.