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The RS Springs sit inside the pressure rings which helps engage the rear lock and the number of springs can be added or subtracted for personal customization
2008-2014 Subaru STI EJ25 (Stock Heat Range #6 - Two Steps Colder)
A single large return orifice is designed to handle high rate flow pumps
Heat Range: 6 (Stock)
No additional adaptors
Apexi N1-X Evolution Extreme Cat Back Exhaust System Coolant System The RS Springs sit insideThe N1 Evolution Extreme is based on the proven performance basics of the N1 muffler which emphasizes optimum exhaust efficiency utilizing a straight thru layout design. Equipped with an internal hybrid silencer uniting power and free flowing characteristics with effective functional sound resonance. A newly adopted muffler tip completes the tail end of the exhaust that serves both purposes of function and form. Constructed with a light weight
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