AMS Intake Manifold Uncoated Subaru WRX 2002-2014 / STI 2004-2021 | AMS.31.08.0001-1

Get a competitive edge with the AMS Performance Subaru EJ25 Intake Manifold! It's designed for high - performance and big HP custom setups, outperforming the competition. After extensive testing, this manifold delivers more power than any other on the market. **Fitment Details**: - Fits 2002 - 2014 Subaru WRX and 2004 - 2021 Subaru STI. - 02 - 05 WRX with EJ20 needs an adapter to use WRX style drive - by - cable throttle body. - 08 - 14 WRX with EJ25 requires an STI - style drive - by - wire throttle body. - 08 - 21 STI may need a bit of clearance for the A/C compressor line. **Key Features**: - Uncoated finish. - Standard rotation configuration. - 4.5 - liter plenum volume for ultimate top - end power. - 13 - inch equal - length intake runners for smooth airflow. - 2.5 - inch intake runner diameter and 3.8 - inch bellhorn OD. - Increased port size at cylinder heads for better matching. - Accepts larger throttle bodies up to 2.625” (66.675mm) or 70mm with mild porting. Engineered by AMS's in - house team, this manifold is cast for strength and optimized for maximum efficiency and airflow. Using Solidworks© and CFD software, it offers a broad power curve and high RPM horsepower capabilities. It provides a wide power - band and great power gains when in boost, improving lap times and giving you the confidence to outperform opponents. **Product Notes**: - Fitment with rotated turbo kits isn't guaranteed due to market variety. - Some port matching may be needed with CNC or hand - ported cylinder heads. - Larger throttle bodies can be used with proper mods and may need adapter flanges. - Cable throttle bodies can be used with custom fitting. - Standard intercooler piping needs mild custom fabrication. - Designed for a common Subaru aftermarket top - feed injector size. - Standard Subaru style injectors can't be used. - Not compatible with side - feed to top - feed conversion rails. - Requires aftermarket rails and lines. - Not compatible with top - mount intercoolers. - Custom bracketry is needed to mount the factory upper coolant reservoir. - The center plenum has ports for vacuum accessories.

Using this AMS intake manifold is a great way to boost your Subaru's performance. First, make sure to check the fitment details based on your car's model year and engine type. If you have a 2002 - 2005 WRX with EJ20, you'll need an adapter for the throttle body. For 2008 - 2014 WRX with EJ25, use an STI - style drive - by - wire throttle body. And if you have a 2008 - 2021 STI, you might need to clear a bit of space for the A/C compressor line. When it comes to injectors, use a common Subaru aftermarket top - feed injector size as recommended. Don't try to use standard Subaru style injectors as they won't work. Also, you'll need aftermarket rails and lines as the stock ones won't fit. If you plan to use a larger throttle body, you'll need to do some modifications and might need adapter flanges. And be aware that standard intercooler piping will need a bit of custom work because of the throttle body's placement. As for maintenance, keep an eye on the intake manifold for any signs of damage or wear. Check the connections regularly to make sure they're tight. Since it's uncoated, you may want to clean it gently to keep it in good condition. Also, pay attention to the vacuum accessories ports on the center plenum. If you use them, make sure the connections are secure. And remember, due to the variety of rotated turbo kits on the market, there's no guarantee it'll fit every brand, so double - check if you have one installed.