The SPOOLOGIC Spider to Intake Plenum Boots SL-420-002 are a pair of silicone connector boots for 1994-1999 Ford F-250, F-350, F-450, and F-550 Super Duty trucks and 1995-1999 Ford E-350 Econoline vans with the 7.3L Powerstroke (engine build date 12/7/1998 and before). These are the two boots that seal the intake spider to each cylinder head plenum on the 7.3L Powerstroke — a known failure point where the factory rubber boots crack, swell, and leak boost into the engine valley.

When these boots fail you lose intake pressure between the spider and the heads, and the truck runs lazy under load — no throttle response, no boost build, and an audible whoosh under the hood. SPOOLOGIC's silicone replacements eliminate the failure mode and outlast the factory rubber by a wide margin. Backed by a SPOOLOGIC 1-year warranty.

Silicone Construction

Each boot is built from heat-resistant silicone with embedded reinforcement fibers — rated to handle far more boost and heat than the factory rubber ever could. Resists heat, pressure, fuel vapor, and oil contamination, and stays flexible through every heat cycle instead of hardening and cracking like the OEM boots.

What's Included

• (2) Silicone spider-to-plenum boots
• (4) Worm-gear hose clamps

Features

• Direct-fit replacement for 1994-1999 7.3L Super Duty trucks and 1995-1999 E-350 Econoline vans (build date 12/7/1998 and before)
• Reinforced silicone — rated well beyond stock boost levels
• Permanently fixes the factory cracked/blown boot failure mode
• Resistant to heat, pressure, fuel vapor, and oil
• Worm-gear clamps included for a complete install
• Black silicone finish — clean, low-key look under the hood

Turbo Application: GTP38

Fits 1998-1999 7.3L Powerstroke

• Early 1999 Ford F-250 / F-350 / F-450 / F-550 Super Duty 7.3L Powerstroke
• 1998 – 1999 Ford E-350 Econoline 7.3L Powerstroke
• Engine Build Date: 12/7/1998 and Before

Replaces Factory OEM Part Numbers

• F4TZ-8287-AAA / F4TZ8287AAA
• F81Z-6C640-FA / F81Z6C640FA

1-Year Limited Warranty

Every SPOOLOGIC spider-to-intake plenum boot kit is covered by a 1-Year Limited Warranty against defects in materials and workmanship from the date of purchase. Warranty coverage requires that the spider-to-intake plenum boot kit first be shipped back to SPOOLOGIC for inspection. If SPOOLOGIC determines the failure was caused by a defect in materials or workmanship, the spider-to-intake plenum boot kit will be replaced at SPOOLOGIC's discretion. Warranty does not cover damage from improper installation, over-tightened clamps, use outside the listed fitment, boost pressure beyond the spider-to-intake plenum boot kit's rated operating range, cuts, abrasion, exposure to oil-saturated CAC plumbing from a failing turbo, chemical attack, cosmetic wear, or normal fading from UV exposure. Warranty does not cover labor, shipping, towing, downtime, clamps, or any other costs outside the spider-to-intake plenum boot kit itself.