6 speed is no issue.

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I am only an asshole on the internet :)

[SIGPIC][/SIGPIC]

Technically it is correct to get modification approval, engineers certificate, inspection and then subsequent engine change no. form.

The site.
Modify a vehicle

Mod approval form
http://www.transport.wa.gov.au/media...htVehicles.pdf

Engine change form
http://www.transport.wa.gov.au/media...gineNumber.pdf

Calc of RAC hp
RAC Horsepower

EJ20 bore 92mm = 3.622", RAC hp=20.99
EJ25 bore 99.5mm = 3.917", RAC hp=24.55

However I am aware of people who have presented cars over the pits with engine displacement changes and simply filled in engine no. change forms. Your call.

Get a 207 instead.

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MY00 WRX. 89 Prelude. 99 CRV

Sleeved EJ20...problem solved. Will still have an EJ20 stamp.

Let me know if you are going down the 2.5 road via PM