Customizing an engine doesn’t mean that you only need to add random parts to your engine and watch it build power.

The process is rather painful and it requires a lot of testing before placing the car on the race tracks. Before adding a customized part, the engineers are thinking if they need that part in the first place, and that’s why they often put the engines to the test, with and without the part, to see if the part that they would buy really does some job, or it is one expensive accessory.

Here on the video we have a pumped up 2JZ engine by Real Street Performance, which now is capable of delivering 1,851 HP. This is one stunning amount of power, and for sure it needs to be tested before it is fitted in any car. And not too many cars can support this kind of powerful engine, because it creates such force that it needs strong structure to hold it in place.

Here this 1,851 HP engine is put to the test, in multiple runs, to see what it can do. There are customized parts fitted and it is time to see what they can add up to the force.