Let us know how you go mate - it would be good to have some opinions from the quality local workshops on the issue.

Regarding mods, have a look at this thread; page 3 has links to a few other useful threads.

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MY99 WRX (Sold)
MY06 WRX 241hp 430nm atw (Sold)
MY09 BMW 135i 247kw atw (Current)