This is the Front Pipe that you need to increase exhaust flow from 4" to 5".  The MBRP Turbo front pipe, removes factory restrictions and moves more air.

Constructed from sixteen gauge aluminized steel you can count on this pipe for many years of reliable service.  Crafted from mandrel-bent tubing in your choice of T409 stainless or aluminized steel (most models),  MBRP has a front pipe to fit your budget. Each pipe features OEM-quality flanges and uses factory mounting locations for a superior fit.