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The factory exhaust will always have restrictions and these restrictions are normally highest near where the catalytic converter is found
Also pickup a DIY harness HERE as well for the electrical required to drive the second FST pump
This low cost solution can reduce the likelihood of discoloration
Requires IE POWERlink Flash Tool
Stage 1 Pack: Cobb Accessport/Invidia N1 Cat Back - Subaru WRX 08-14/STI 11-14 (Sedan) Direct Fit Fuel Rails The factory exhaust will alwaysPurchase together and save! We've bundled the popular Cobb Tuning Accessport V3 with the Invidia N1 Cat Back Exhaust for a plug and play Stage 1 Package. Bolt on performance and tuning. COBB ACCESSPORT: Simple ECU flashing with gauge package! The new in cabin mountable Accessport V3 has a large, full color, higher resolution screen which allows you to monitor up to six parameters in real time. Fully customizable from the look (multiple bezel colors),
US$ 45.95
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US$ 45.95
US$ 39.95