If you own a 1997–1999 Porsche Boxster with the 2.5-liter flat-six engine (often called the 986), you know that keeping it on the road takes regular maintenance. RockAuto is a popular online source for OEM and aftermarket parts, but with so many options, it's easy to feel overwhelmed. This guide covers the most common parts you'll need for the 2.5 Boxster and how to pick the right ones on RockAuto.
Understanding Your 2.5 Boxster
The first-generation Boxster (986) launched in 1997 with a 2.5L M96.25 engine. It produced 201 horsepower and was known for its mid-engine layout and sporty handling. Common issues include IMS bearing failure, coolant pipes, and convertible top problems. When shopping on RockAuto, you'll need to enter your car's exact year, engine, and transmission to filter compatible parts. Double-check part numbers before ordering.
Engine Parts for the 2.5 Boxster
IMS Bearing and Clutch Components
Rear main seals, IMS (intermediate shaft) bearing upgrades, and clutch kits are crucial for long engine life. RockAuto offers several brands:
- LN Engineering – Known for ceramic IMS bearings
- Sachs – OEM clutch kit supplier
- Luk – High-quality clutch replacement
Choose a full kit if you're in there. Note that the 2.5 engine uses a single-row IMS bearing; retrofit kits are available.
Cooling System Parts
The plastic coolant pipes on the 2.5 are prone to cracking. Replace with metal pipes from EMP Stewart or Gates – both sold on RockAuto. Also consider:
- Water pump ( Gates or Porsche OEM )
- Thermostat housing ( Febi Bilstein or OEM )
- Radiator ( Behr or Nissens )
Serpentine Belt and Tensioner
Replace the belt and tensioner every 60,000 miles. RockAuto carries ContiTech, Gates, and INA tensioners. Get the belt with the correct length (often 6PK2040).
Suspension and Steering Parts
Strut Mounts and Control Arms
The Boxster rides on coilover-style struts up front and separate springs in the rear. Worn strut mounts cause clunking. Brands at RockAuto:
- Sachs – OEM struts
- Bilstein – B6/B8 performance shocks
- Lemförder – High-quality control arms
Check for ball joint wear; many control arms are sold as complete assemblies (with bushings and ball joint).
Tie Rods and Sway Bar Links
Inner tie rods from TRW or Moog are common. Sway bar links from Febi or Porsche – measure front vs rear (they differ).
Braking System
Rotors and Pads
Standard front rotors are 298mm, rears 290mm. Drilled or slotted rotors add look but not much performance for street use. Brands:
- ATE – Premium for German cars
- Brembo – OE supplier
- Textar – Dust-resistant pads
For aggressive street use, consider EBC Redstuff or Akebono ceramic pads.
Brake Calipers
Rebuilt calipers are available from Cardone or A1 Cardone. If yours are leaking, replace instead of rebuilding—time is valuable.
Electrical and Sensors
Ignition Coils and Spark Plugs
The 2.5 uses six individual coils. Beru (OEM) or NGK (premium, but fitment varies). Spark plugs: NGK PFR6Q or Denso Iridium. Gap to 0.032 inches.
MAF Sensor and O2 Sensors
Mass airflow sensor from Bosch direct fit. O2 sensors upstream (pre-cat) and downstream. Bosch or Denso.
Convertible Top Parts
The cloth top is a common failure. RockAuto sells:
- Hydraulic cylinders ( Kabelschlepp or OEM )
- Pump ( Febi )
- Repair panels for tear holes ( Sierra Madre Collection – note: not always stocked)
If your top is stuck, check fluid levels before ordering parts.
How to Navigate RockAuto for the 2.5 Boxster
- Select your car: 1997-1999 Porsche Boxster with 2.5L, manual or Tiptronic.
- Browse categories: Engine, Brakes, Suspension, etc.
- Look at the “Info” tabs for fitment details.
- Compare brands: Often, “Daily Driver” grade is fine for street; “Premier” for longer life.
- Check shipping: Separate warehouses mean multiple boxes. One part may come from CA, another from TX.
Final Recommendation
For most 2.5 Boxster owners, focus on critical wear items first: IMS bearing, water pump, and coolant pipes. Use quality brands like Gates, Sachs, and Bosch from RockAuto. Avoid no-name brands – saving $20 isn't worth the risk of a tow. For suspension, Bilstein B6 shocks paired with Lemförder arms give a refined ride. Brake pads should be Akebono for low dust or Textar for feel. Always double-check part numbers with your VIN. RockAuto's return policy is straightforward, but measure twice, order once.
Your Boxster 2.5 is a driver's car. With the right parts from RockAuto, you can keep it performing like new without breaking the bank.