ISR Performance S14 SR20DET Turbo Lines - Bottom Mount

The ISR Performance S14 SR20DET Bottom Mount Turbo Lines are a direct replacement steel braided oil and water line set for the factory turbo hardlines on S14 and S15 SR20DET bottom-mount turbo configurations. Built from current-generation racing hose with a pre-dyed black Nomex outer cover and Kevlar reinforcement, terminated with aircraft-grade fittings. New aluminum crush washers included.

What It Does

The factory SR20DET oil and water lines to the turbo are steel hardlines that crack, leak, and corrode over time. Replacing them with braided AN-style lines fixes those failure modes, gives you serviceable AN fittings instead of single-use hardline crimps, and visually cleans up the bottom-mount turbo area of the engine bay considerably.

This kit covers both oil feed and water lines and is a direct OEM replacement, so no chassis modifications or alternate routing is required.

Critical Note: Ball Bearing Turbos Need an Oil Restrictor

If you're running a ball bearing turbo (including the factory S14 or S15 SR20DET turbocharger), you MUST add an additional oil restrictor. Oil restrictors are NOT included with this line set. Ball bearing turbos require restricted oil feed pressure to prevent over-oiling and damage, and the factory hardline included a restrictor that's not present in this braided replacement set.

Hose Construction

• Black nylon reinforced synthetic rubber inner tube
• Pre-dyed black Nomex outer cover for fade-resistant appearance
• Kevlar reinforcement in the Nomex cover for abrasion resistance and tensile strength
• Up to 45 percent lighter than conventional high performance racing hose assemblies
• Fire-retardant outer cover

Fitment

• 1995-1998 Nissan 240SX (S14) with SR20DET, bottom-mount turbo
• Nissan S15 SR20DET, bottom-mount turbo

Not for top-mount turbo configurations (use IS-T25-NS14-EXT for S14 top-mount).

What's in the Box

• Complete S14/S15 SR20DET bottom-mount turbo line set (oil and water)
• Aircraft-grade AN fittings
• New aluminum crush washers

Not included: Oil restrictor (required for ball bearing turbos)

Product Details

Brand: ISR Performance

Part Number: IS-T25-NS14

Type: Steel Braided Turbo Oil and Water Line Set

Vehicle Fitment: S14 and S15 SR20DET with bottom-mount turbo

Turbo Configuration: Bottom-mount only

Ball Bearing Turbo Warning: Additional oil restrictor REQUIRED (not included) - factory S14/S15 SR20DET turbos are ball bearing

Replaces: Factory bottom-mount steel hardlines

Hose Construction: Black Nomex cover, Kevlar reinforced, synthetic rubber inner

Fittings: Aircraft-grade AN

Crush Washers: New aluminum washers included

Top-Mount Variant: IS-T25-NS14-EXT (for S14 top-mount setups)

Sold: Complete oil and water line set (no oil restrictor)

Legality: Off-road and competition use only