In our class, Improved production you must run your original door trims but as for side intrusion. We have a roll cage which was designed and built not long after the Greg Hansford fatality at Phillip Island. So my team's side intrusion bars are a lot higher than most other cars. We also have a protective box sort of device which will stop the cage splitting if a direct hit on the drivers side should tear the cage. It makes it harder to get in and out for the older and larger driver like my dad. That is why we also have a removable hub on the steering wheel so he can get in and out more easily. I on the other hand have no problems. hehehe. But after an accident earlier this year again at the island when a mate of mine's Mazda RX7 came over Lukey Heights at full noise to find a sideways RX3, we all realised why side intrusion bars are such a good thing. It hit on the passenger side of the car and moved the side of the car right up to the driver. Luckily it stopped short of him, but imagine if it had have been drivers side. Both Car's were write-offs but it just shows that a little bit of protection buys peace of mind. I can tell you I am glad to have our cage.
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