The answers to all of your questions can be found within these forums, use the search feature with your keywords and you will find more than enough information.
As for the 180HP car, in my opinion (although I'm not sure about the price of the 180) it can't be worth it to pay the extra for the 180 over the non aspired model. 15HP gain over stock, why bother? I think those 180's are a bit of a cash grab and not much more.
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PianT
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