The SPOOLOGIC Turbo Outlet Boot SL-420-060 is a brand new, direct fit replacement silicone outlet boot for the 1989-1991 non-intercooled 5.9L 12-Valve Cummins (H1C turbo). This is the boot that connects the turbo compressor outlet to the intake plumbing on early non-intercooled trucks — a single high-quality 5-ply reinforced silicone hose with two stainless worm-gear clamps included. The factory rubber hose on these trucks dries out, cracks, and develops boost leaks; this is a permanent fix.

Built with the same 5-ply silicone construction used across the entire SPOOLOGIC boot line — far tougher than OE rubber and impervious to the heat and oil mist that destroy stock hoses. Every SPOOLOGIC silicone boot is backed by a Lifetime Warranty.

5-Ply Silicone Construction

This boot is built to the SPOOLOGIC spec used across the full silicone line — not a cheap rubber replacement:

• 5-ply reinforced silicone — three layers of premium silicone bonded around two layers of high-tensile polyester fabric, vulcanized into a single composite wall that resists ballooning under boost
• Glossy black finish — clean, professional look that blends with any engine bay
• Stamped “SPOOLOGIC” — identifies the part and confirms the lifetime warranty stamp on every piece
• High-temperature rated — built for the under-hood temperatures of a turbo-diesel CAC system, where OE rubber goes brittle and cracks
• Oil-mist resistant — silicone doesn’t swell, soften, or de-laminate when exposed to the oil residue that builds up in CAC plumbing over time
• Will not collapse under vacuum — the polyester reinforcement keeps the boot round during high-flow / high-vacuum events that flatten weak rubber hoses

Stainless Worm-Gear Clamps Included

Two stainless steel worm-gear (band-style) hose clamps are included — sized for the boot and ready to install. These are the correct clamp style for a single low-pressure turbo outlet boot on a non-intercooled application.

What’s Included

• 1 SPOOLOGIC 5-ply silicone turbo outlet boot (as pictured)
• 2 Stainless steel worm-gear hose clamps

Features

• Direct-fit replacement turbo outlet boot for 1989-1991 Dodge 5.9L 12V Cummins (non-intercooled)
• 5-ply reinforced silicone construction — polyester fabric reinforcement bonded between silicone layers
• Black silicone with stamped SPOOLOGIC identification
• 2 stainless steel worm-gear clamps included
• Resists collapse, ballooning, and oil-mist swelling that destroy OE rubber boots
• Direct OE replacement — no fab, no trimming, no surprises
• Lifetime Warranty on every boot

Turbo Application: H1C

Fits 1989-1991 5.9L Cummins 12-Valve

• 1989 – 1991 Dodge 250 / 350 5.9L Cummins 12-Valve
• Early Built 1991 Non-Intercooled

Replaces Factory OEM Part Numbers

• 4429181
• 4429690

Backed by a Lifetime SPOOLOGIC Warranty

The SPOOLOGIC 5-Ply Silicone Turbo Outlet Boot is designed to last a lifetime. Every boot is built from high-temperature silicone reinforced with 4 layers of polyester fabric between 5 plies of silicone, engineered for continuous boost pressure and underhood heat cycling that shreds OEM rubber. Factory boots harden, crack at the bead, and blow off under load — these silicone boots stay pliable and hold their seal for the life of the truck. If a boot fails under normal use, SPOOLOGIC will replace it for the original purchaser — no time limit, no questions.