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I'm new to finding engines interesting so please forgive the question if the answer's obvious.... I was wondering if I should/n't put higher octane fuel in my 1.8T, such as Tesco 99 or V-Power? Will I notice any power difference or is this fuel not suitable for these engines? Thanks.

This may have come up before but didn't see it, sorry if it has! I've got intermittent fuzziness in my driver's door speaker and I think its a dry solder joint in my bose amp. I'm not much of an electrician so was wondering if I would have any problems swapping it out with a bose amp from a...