Description
The Mishimoto MMCP-R90-2540BK is a 90-degree black silicone transition coupler built to bridge tight, angled connections in coolant and air passage routing where a straight hose simply won’t reach. With a 2.5-inch inside diameter on one end stepping out to a 4.2-inch outside diameter on the other, this transition elbow is purpose-made for reworking piping layouts that demand a sharp directional change without sacrificing durability.
Part of Mishimoto’s expanding silicone coupler lineup, this piece is constructed from four layers of 100-percent silicone, each separated by a layer of heat-resistant embedded fibers, giving it the strength to handle extremely harsh underhood environments. It’s rated for temperatures up to 330F and built to tolerate substantial boost pressure, making it a smart choice for anyone rerouting intercooler piping or coolant lines as part of a broader air intake system or cooling system upgrade. Because it’s rated for both coolant and air applications, the same coupler design that helps route pressurized intake tubing can also be used to solve awkward coolant hose transitions elsewhere in the engine bay. This coupler is offered in black to blend cleanly into most engine bay color schemes, and it’s backed by the Mishimoto Lifetime Warranty.
Vehicle Applications
This 90-degree silicone transition coupler is a universal-fit component rather than a vehicle-specific part, designed to be dropped into custom or replacement coolant and air intake piping setups wherever a 2.5-inch to 4.2-inch, 90-degree transition is needed. It’s suited to project vehicles and engine bays where builders are rerouting intercooler pipes or coolant lines and need a durable elbow that matches their required diameters and bend angle.
Features
- Allows for easy routing of complex coolant or intercooler pipes
- 100-percent silicone construction
- Constructed from four layers of silicone with embedded heat-resistant fibers
- Rated for temperatures up to 330F
- High pressure tolerance ideal for use on intercooler pipe connections
- Applicable for both coolant and air systems
- Available in black to match any engine bay
- Backed by the Mishimoto Lifetime Warranty
Specifications
- Material: Silicone
- Shape: 90-Degree Transition (Transition Elbow)
- Color: Black
- End 1 Inside Diameter: 2.5 in
- End 1 Outside Diameter: 2.7 in
- End 2 Outside Diameter: 4.2 in
- Maximum Temperature Rating: 330F
- Coolant Compatible: Yes
- Hose Clamps Included: No
- Purchase Includes: (1) Mishimoto 90-Degree Transition Coupler, Mishimoto Lifetime Warranty
Frequently Asked Questions
What is the Mishimoto MMCP-R90-2540BK coupler made from?
It is constructed from four layers of 100-percent silicone, each separated by a layer of heat-resistant embedded fibers.
What temperature and pressure can this coupler handle?
It is rated for temperatures up to 330F and can withstand substantial boost pressure.
Can this coupler be used for both coolant and intake piping?
Yes, this silicone transition coupler is applicable for use in both coolant and air passage systems.
What are the diameters on this 90-degree coupler?
End 1 has a 2.5-inch inside diameter and a 2.7-inch outside diameter, while End 2 has a 4.2-inch outside diameter.
Are hose clamps included with this coupler?
No, hose clamps are not included with this coupler.
What color options are available for this coupler?
This coupler is offered in black; Mishimoto’s broader coupler line is also available in blue and red.
âš WARNING (California Proposition 65): This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.






