What do you guys think can be done to the upcoming 4.8i to get the extra horsepower and torque needed to outperform the outgoing 4.8is?

could 20 more horsepower and torque be had for a relatively cheap price... say less than $5K in the aftermarket?

I don't think I "need" more performance beyond the outgoing 4.8is .... this just maybe a mental block that I gave myself since I am sure the price tag for the upcoming "is" replacement will be out of my realm so I got to live as close to the dream as possible in the 4.8i with slight mods.

Thanks

Curtis