Just ordered my 2015 WRX today and began the search for a cat-back exhaust.
It looks like Perrin has already tested their exhausts and released a model that fits the 2011 - 2015 WRX/ STi's.
Does this mean that all (most) 2011 - 2014 WRX/STi exhausts will fit the 2015 models?
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Here are a list of the exhausts that have been confirmed to fit (or not) thus far.
Fits:
Perrin Axle-Back - $785.00
Perrin Cat-Back (Dual Tip) - $945
Perrin Cat-Back (Quad Tip) - $1098
Tomei Expreme Ti Titanium Catback Exhaust (Single Exit) - $991
Tsudo Catback Exhaust (Quad Tip) - $500
Nameless Exhaust System (2015 model) - $950
Does Not Fit:
Invidia Q300 (needs larger hangers)
(info gathered/stolen from
this thread on IWSTI)