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5 Jeff Stich of JDM Engineering lowers the Roushcharger on to the lower manifold. It is torqued down using the step method—10 Nm, 20 Nm, and finally 30 Nm. A bolt-on pulley has been incorporated into this version of the Roushcharger so enthusiasts have the option of turning up the boost. Doing so will void Roush’s warranty on the product.