I'm not sure if anyone has made mention of this in previous posts but I found an e-test facility that ASKS YOU if your car is a "HOT ROD" , answering yes to this and providing them copies of invoices or recepits, or some other document from a certified garage and mechanic, signed. Proving to them the modifications to your car are factual, actually increases your limits and makes passing a lot easier.

Hope this is of some help to you guys!