I made this model to block off the EGR system on the Toyota Landcruiser 100 series, this pipe should fit in any Landcruiser with an EGR system. This is what an EGR is: Exhaust Gas Recirculation (EGR) is a system in car engines that reduces pollution by recirculating some exhaust gas back into the engine. This lowers the combustion temperature, cutting down on harmful nitrogen oxides (NOx). 
 
The system uses a valve to control the flow of exhaust gas. EGR helps make cars cleaner and can improve fuel efficiency and engine performance. I think that an EGR System is bad because the engine is forced to use up dirty air from the exhaust and not clean air from the outside. This in my opinion can shorten engine life and give you less power. Some people say that you should just block off the EGR Pipe tract, but I think that if you do this your engine might not have enough air intake and not be able to produce enough power/torque.
 
This part can trick the EGR system and instead of using exhaust for the intake, the part will make it so that the engine will get fresh air and this should make your engine last longer.
 
Also, if you are printing it I recommend you print it in something more heat-resistant than PLA or PETG.
 
Here is a tutorial on how to install it:
(The video is in Russian but, if you just follow along with what the guy does you can figure it out, it is not too hard.)

Hope this helps!