you can get a lot of horsepower for a good price in the wrx so maybe you should overkill them.
if you wind out your gears youll still be in boost range when you shift.

 

if you can launch you car right you will smoke all of them. I have beaten crxs with motor swaps and all the bolt ons. Thier not all that.Now if thier turboed or supercharged or using N2O with a motor swap you will probaly lose. For me with a mbc and turbo back its a toss up.