A good package to get if you want to hear a nice rumble and feel a more power out of your STI. Although an OTS map won't support the air intake in addition, the combo will max the stock injectors. In order to add or if you already have the SF intake you would need a Lakeview Automotive – Protune. 

The COBB Stage 2 Power Package is a simple bolt-on and tuning solution for your 2015+ STI! You get the Accessport tuning convenience, a big increase in power and torque from a free-flowing turbo-back exhaust, and a Stage 2 tune! Listen to the intoxicating rumble of the Subaru boxer engine as it emits through our beautiful 3" Stainless Steel exhaust. Finish off the installation with a Stainless Turbo Heatshield. Your Subaru will love you for it!

FEATURES

Subaru Stage 2+ Power Package STI Sedan 2011-2014

• SUB-004 Accessport V3
• 3" Stainless Steel Downpipe w/ Cast Bellmouth
• 3" Stainless Steel Cat-back Exhaust
• Stainless Steel Turbo Heatshield