Cheryl88 will be pleased to have another 'wee girly' along -

I think she was feeling a bit lonely here. Your car sounds really nice. Go with carbon fibre - it looks great on Grey. Hope your new sounds system ROCKS - let us know - we've jsut started an ICE (in car entertainment) section here so if you have any tips to pass on feel free.
The underbonnet stuff is not that complicated - especially when you've got us lot to explain it to you - the main site is a good place to start to get an overview of what is involved in tuning
