I've talked to afew people that have a 10.5 and they all say there really isn't much gain over stock. I'm sure if you want to make 400+whp, its probably a good upgrade but I'd rather just port out the stock mani, o2 and turbine, save the $ for other things. It doesn't help that its 250$ either, maybe if it was around 150 or so, it may be worth it.