Sportback Is stage 2 worth it?

Iv a prefacelift tuned stage one by Rick at unicorn, just secondary decat and intake pipe, running 420 and 450ft/lb

Is it worth the money to buy Down pipe and intercooler for the noticeable gains you get back?
I will most likely never track the car.
I know these suffer with out an intercooler once hot.
 
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