The SPOOLOGIC 5-Ply Silicone CAC Intercooler Boot Kit SL-420-025 is a brand new, complete direct-fit replacement boot kit for the 2017-2019 L5P Duramax. Replaces every factory CAC boot in one shot — no more chasing one-off cracked or oil-soaked boots, no more boost leaks, no more limp-mode frustration from a worn-out OE hose.

SPOOLOGIC boots are built from 5-ply reinforced silicone with high-temperature polyester reinforcement plies bonded between the silicone layers — the construction method used on professional motorsport plumbing. The result is a boot that holds boost, shrugs off the heat soak of a turbo-diesel engine bay, and won’t collapse, balloon, or weep oil mist like a tired OE rubber hose. Every SPOOLOGIC silicone boot is backed by a Lifetime Warranty.

5-Ply Silicone Construction

Every boot in this kit is built to the same spec — 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 Steel T-Bolt Clamps Included

This kit ships with 8 stainless steel T-bolt clamps — two per boot, every clamp pre-matched to the boot it goes on. T-bolt clamps deliver uniform 360-degree clamping force across the full circumference of the boot, far better than the cheap worm-gear (band) clamps that ship with bargain boot kits. Stainless construction won’t rust under the hood, and the wide band won’t cut, deform, or stretch the silicone over time.

What’s Included

• 4 SPOOLOGIC 5-ply silicone CAC boots — complete kit as pictured
• 8 Stainless steel T-bolt clamps — two per boot, sized to match
• 1 Factory-style CAC boot support bracket

Features

• Complete direct-fit boot kit for 2017-2019 Chevy/GMC 6.6L Duramax L5P
• 5-ply reinforced silicone construction — polyester fabric reinforcement bonded between silicone layers
• Black silicone with stamped SPOOLOGIC identification
• 8 stainless steel T-bolt clamps included — two per boot
• Factory-style boot support bracket 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: B2BV / B2BV-70A

Fits 2017-2019 6.6L Duramax L5P

• 2017 – 2019 Chevrolet Silverado GMC Sierra 2500 / 3500 6.6L Duramax L5P

Replaces Factory OEM Part Numbers

• 19541188
• 84189332

Backed by a Lifetime SPOOLOGIC Warranty

The SPOOLOGIC 5-Ply Silicone CAC Intercooler Boot Kit 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.