Advice on Exhaust improvement
 

Hi People, I have just aquired a fresh import 2003 WRX Wagon, it is totally standard and missing the beautiful rumble sound, could you please offer some advice how i can obtain said rumble without replacing the full exhaust. I don't want it to sound crazy but need a little more than the standard Jap spec is giving.
Thanks in advance

there is some parts that you can find in ebay for example that would do the work for you

Simple way is a Prodrive back box, will add a nice rubble. But don't JDM cars have equal length manifolds, so to get a proper deep rumble will need to fit unequal length manifold.