Fitment Information: This intake manifold fits 2002 - 2014 Subaru WRX and 2004 - 2021 Subaru STI. Note that it will fit 02 - 05 WRX with EJ20 only when using an adapter for the WRX - style drive - by - cable throttle body. 08 - 14 WRX with EJ25 needs an STI - style drive - by - wire throttle body. 08 - 21 STI may require slight clearancing of the A/C compressor line. Features: Get an edge over your competitors with the AMS Performance Subaru EJ25 Intake Manifold! It's designed for high - performance and big - HP custom setups. After lots of testing, it outperforms other intake manifolds on the market. Key features include a texture red powder coating, standard rotation configuration, a 4.5 - liter plenum volume, 13 - inch equal - length intake runners, a 2.5 - inch intake runner diameter, a 3.8 - inch bellhorn OD, increased port size at cylinder heads, and a throttle body opening that can accept larger throttle bodies. Engineered To Be The Best: AMS used years of engineering experience to design this intake manifold. It was designed, prototyped, and tested in - house. Casting the manifold makes it stronger and allows for optimized power output. Using Solidworks© and CFD software, it has a large 4.5L plenum for top - end power, CNC - machined bellhorns for a broad power curve, and 2.5 - inch tapered runners for excellent flow. Unmatched Power Gains and Excellent Response: This intake manifold offers more than just top - end power. It provides a wide power - band and a significant power boost when in boost, improving lap times and giving you the confidence to outperform opponents. Product Notes: Due to the variety of rotated turbo kits, fitment with every brand can't be guaranteed. Some port matching may be needed with CNC or hand - ported cylinder heads. Larger throttle bodies can be used with modifications. The intake manifold is flanged for 04 - 21 STI drive - by - wire throttle bodies, but cable throttle bodies can be used with custom fitting. Standard intercooler piping may need mild custom fabrication. It uses a common Subaru aftermarket top - feed injector size, and standard Subaru style injectors can't be used. It's not compatible with side - feed to top - feed conversion rails, requires aftermarket rails and lines, and isn't compatible with top - mount intercoolers or the factory upper coolant reservoir without custom bracketry. The center plenum has ports for vacuum accessories, and 2008 - 2021 STI may need A/C compressor line clearancing.
How to Use: Install the intake manifold according to the fitment information provided. Make sure to use the appropriate throttle body and injector as specified. If you're using a larger throttle body, follow the modification instructions. Be aware that some custom fitting may be required depending on your vehicle setup. Precautions: Since fitment with all rotated turbo kits can't be guaranteed, check for interference with the cylinder 3 intake runner before installation. When using CNC or hand - ported cylinder heads, be prepared for some port matching. Always use the recommended Injector Dynamics brand injectors. Maintenance: Regularly check the intake manifold for any signs of damage or leaks. Keep the throttle body clean for optimal performance. If you notice any issues with power output or response, have the intake manifold inspected.
