System1 Designs 45-Degree Elbow Reducer Silicone Coupler | 1.75" to 4.0" Various Sizes

System1 Designs
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System1 Designs 45 Degree Elbow Reducer Coupler

System1 Designs's line of silicone couplers feature 3 layers of polyester reinforcement and are suitable for applications with boost pressures up to 45psi. They also feature a temperature rating of 428°F for direct to turbocharger installations.


  • Black Color
  • Material: 3-ply Polyester Reinforced
  • Temp: 428 Degrees °F (220 °C)


  • Universal

What's in the Box?

  • (1) 45 Degree Elbow Reducer Coupler Black

Customer Reviews

Based on 5 reviews
Brian Jones

Super fast shipping ! Was a breeze to replace the original coupler from my MAP charge pipe , still the best ever , replaced due to my mistake I damaged the original Installing carbon Intake cover …
Thank You Map for always coming through .

Jonathan Nichelson

This part was a perfect solution to my problem... perfect fit with my cold air intake!!

Peter Kraft
3" into 2.5"

Fits the stock Vanagon diesel intake, and cheaper than the correct VW part.

The drivers side coupler for map piping on Ecoboost mustang

Called MAP and they hooked me up with this transition elbow.
This is one of the couplers you need for the Ecoboost mustang if you upgraded the intercooler piping and don’t have all the couplers. This one is for the drivers side intercooler to cold side pipe. Install was done without removing the bumper from the engine bay. Would have been easier with the bumper removed and coming at it from below. Great product and fast shipping. Thanks MAP!

Patrick Buchanan
Best quality out there

These reducers are the best couplers on the market. Fit perfect and look awesome and they make the intercooler piping look very professional..Maperformance makes the best intercooler piping kit on the market. Their customer service is top notch!! I'm a life time customer.