Ultra 40 Wire Sleeve - 25ft. Roll

The MOROSO Ultra 40 Wire Sleeve is a 25ft roll of fiberglass and silicone spark plug wire protection designed for engine builders, hot rodders, and automotive enthusiasts who demand reliable ignition system management. This product addresses a critical need in custom engine builds and high-performance applications where stock wire routing proves inadequate or where heat shielding becomes essential. Whether you're constructing a show car, restoring a classic, or tuning a street machine, proper spark plug wire management prevents arcing, improves ignition reliability, and protects wires from engine bay heat and abrasion.

The Ultra 40 Wire Sleeve combines fiberglass reinforcement with silicone construction to withstand sustained temperatures and resist oil, coolant, and fuel exposure—common hazards in performance engine compartments. The 8.65mm interior diameter accommodates standard spark plug wire gauges without binding or restricting flexibility, while the sleeve's braided structure allows for custom routing and bundling. This 25ft roll provides sufficient coverage for a complete ignition harness on most V-8 and inline engines, with material that remains flexible during installation and throughout engine operation cycles. The blue color finish aids in visual identification during maintenance and inspection of ignition system components.

Serious mechanics and engine builders favor the Ultra 40 Wire Sleeve for custom engine installations, vintage car restorations, and high-heat engine bays where wire degradation poses reliability risks. Installation is straightforward—simply slide the sleeve over existing spark plug wires before connecting to spark plugs, then secure with tie-downs or clamps as needed. The 0.89 lb roll weight makes handling convenient during assembly, and the compact 7.1 x 1.15 x 9.3 inch package ships efficiently. This product works with any standard ignition system and pairs effectively with custom valve covers, headers, and intake manifolds where wire access and clearance are concerns.