I know that car fairly well, I'm friends with the previous owner...
It had an in car tune by Overkill (Will) with all of it's current modifications...You don't have to worry about knock with that thing.
Assuming it's stock, you will have no problem walking your brother's car...The generation of GTs are slow!
Will also did an in car tune for my GT when it was NA with just a u-bend del, intake and L67 TB...It responded very well....Since then I have put a new engine in and gone with a turbo from Kevin at CarTuning. Kevin did the in car for that and the car is amazing...I would recommend either one of those guys.
cartuning.ca
getoverkilled.ca
