The difference between the PE and OEM 135i exhaust is simply the design of the muffler in the PE. The diameter of the piping is exactly the same as OEM. The only real gain you get from the PE is sound and maybe 1-2 hp.
Quote:
Originally Posted by sochermit
What is the major difference between the PE and the standard one? Is the muffler the same? What happens to the vacuum hose when a PE is installed? Do they insert any code that tells the cars a PE in installed?
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