Either way you'd need to remap!
I would go front mount for anything less than 420 bhp!
Just upgrade to an STI top mount the type 25 uses it with 415bhp with no problems!
also I'd sooner go for a genuine mitsubishi TD05 18g in steadof the 16g big! even a second hand one!
And lastly STI 550cc injectors! that should get you around the 350 -360 bhp mark!
On the other hand scoobyke is running the ebay setup! It might by worth hooking up with him for a chat!
Best of luck!
Dan