Manley Performance 46997DT-4 Premium Steel Ring Set 99.75mm Bore 1.2/1.2/2.0mm

Vehicle Fitment

• 2004-2021 Subaru WRX STI (EJ25 2.5 L turbo, 99.75 mm bore)
• 2008-2014 Subaru WRX (EJ25 2.5 L turbo, 99.75 mm bore)
• Other Subaru EJ25-based engines with 99.75 mm bore rebuilds

Fitment Notes

• Ring set for 99.75 mm bore cylinder -- confirm bore dimension before install.
• File-fit top and second rings required; oil ring set is pre-tabbed.
• Designed for high-performance and forced induction builds -- not a stock replacement ring set.
• For racing/high-boost use -- warranty limited due to intended use.

Features

• Premium steel top ring and Napier-style second ring for excellent sealing.
• Ring widths: 1.20 mm (top) / 1.20 mm (second) / 2.00 mm (oil rail).
• Tab-bed oil ring design (9-13 lbs tension) for improved oil control.
• Ideal for high HP or turbo setups where ring durability and sealing matter.
• Sold as a set for 4 cylinders (complete engine set of rings).
• Manufactured by Manley Performance -- trusted brand in performance engine components.
• Precision set for 99.75 mm bore builds, making it suitable for those specific enlargements or custom engines.
• File fit application ensures custom fitment and optimum performance when installed correctly.

Specifications

• Part Number: 46997DT-4
• Bore Size: 99.75 mm
• Top Ring Width: 1.20 mm
• Second Ring Width: 1.20 mm
• Oil Ring Width: 2.00 mm (tabbed rails)
• Oil Ring Tension: 9-13 lbs (approx.)
• Application: File-fit only -- requires proper ring gap and file-in install.
• Set Quantity: Set for 4 cylinders (engine complete ring set).

Included Components

• 1x Ring Set (4 cylinders) - Manley 46997DT-4
• 1x Instruction sheet with file-fit procedure and ring gap guidance

Product Description

The Manley 46997DT-4 Premium Steel Ring Set is engineered for Subaru EJ25 engines bored to 99.75 mm -- typically found in performance WRX STI and WRX turbo builds. With a 1.20 mm top ring, 1.20 mm second ring and 2.00 mm oil ring with tabbed rails, this set offers strong sealing and excellent oil control for high-boost, high-RPM environments.

Sold as a complete engine set, the 46997DT-4 is targeted at professional rebuilds and high-performance applications where stock ring sets do not suffice. Installation requires proper file-fit gap setup, piston installation and break-in procedure. Ideal for those building 99.75 mm bore EJ25 turbo engines or custom variants, this Manley ring set brings performance and durability to racing and enthusiast builds.