Cummins ISX & X15 T6 Exhaust Manifold Spacer Kit

This exhaust manifold spacer kit is designed specifically for Cummins ISX and X15 engines equipped with an aftermarket T6 exhaust manifold. Unlike the factory VGT manifold, a T6 manifold positions the turbocharger lower on the engine, requiring a unique combination of spacer lengths to ensure proper hardware engagement.

This kit includes:

• 10 Long Exhaust Manifold Spacers
• 2 Short Exhaust Manifold Spacers

The two short spacers are installed in the manifold mounting locations directly beneath the turbo flange. Because the T6 mounting flange sits lower than the factory VGT manifold, these locations require shorter spacers (and matching shorter bolts or studs) to maintain the correct clamping force and thread engagement.

Features

• Complete spacer kit for aftermarket T6 exhaust manifold installations
• Includes 10 long spacers and 2 short spacers
• Designed specifically for non-VGT Cummins ISX and X15 applications
• Correct spacer lengths for proper manifold alignment and hardware engagement
• Heavy-duty steel construction for long service life
• Recommended whenever replacing manifold hardware or installing a new T6 manifold

Fits

• Cummins ISX CM871
• Cummins ISX CM2250
• Cummins ISX CM2350
• Cummins X15
• Aftermarket T6 flange exhaust manifold applications only

Important Fitment Information

This spacer kit is designed exclusively for aftermarket T6 exhaust manifolds.

The T6 turbo mounting flange sits lower than the factory VGT manifold, which changes the stack height of the hardware beneath the turbocharger. To compensate, the two manifold mounting locations directly under the turbo flange require shorter spacers and shorter bolts or studs than the remaining ten locations.

This kit includes the correct combination of 10 long spacers and 2 short spacers, eliminating the guesswork and ensuring the manifold clamps evenly across the cylinder head.

Why Replace the Spacers?

The exhaust manifold expands and contracts every time the engine heats up and cools down. The spacers are a critical part of the mounting system, helping distribute clamping force evenly while reducing stress on the manifold and cylinder head.

Worn, rusted, or incorrect spacers can cause uneven clamping, exhaust leaks, warped manifolds, and broken hardware. Replacing them during a T6 manifold installation is inexpensive insurance that helps ensure a reliable, leak-free installation.

Whether you're replacing a cracked manifold or converting your ISX or X15 to a fixed-geometry turbocharger, this spacer kit provides the correct hardware configuration for a professional-quality installation.