I too am about to purchase the oem spoiler with "hump". However, I had a question for the members on this site. I've read the "hump" spoiler directs the wind down, which I assume would actually lift the spoiler up. If thats the case, is there any danger of the spoiler flying off my car due to the wind pressure? Do factory equipped 4runners with the "hump" spoiler come with additional reinforcements? If so, will the dealer add this reinforcement for my 4runner when I take it in to install the spoiler? I don't quite understand how the spoiler could stay on if it is directing the wind down, which in effect, would lift the spoiler up and away from the car. I would think at the very least, it would start to come loose and could possible damage the hatch. Any help or experience would be appreciated.
Also, let's not make this a thread about which type of spoiler is better. Personally, I like the "hump" so that's why I am asking about this particular type of spoiler. The dealer also told me that they'll only warranty it for 1 year and I'm worried after that 1 year, I may run into problems. As for the other questions, I don't trust the dealers since they'll say anything to try and sell me the spoiler.