exhaust to mount up to your "new" testpipes, if they don't bolt up. I don't know the diameter nor bend configuration to guess how much (if any) of a restriction your existing exhaust is. But on a turbo car, the most beneficial components (performance wise), are the downpipes. So you done good there! You will notice a significantly quicker spool up time, and increased power throughout the powerband. It's one bolt on that doesn't have any performance downside. Enjoy!