A "GUNDO HACK", is turning a stock 997 muffler into a PSE (Porsche Sport Exhaust).

This is accomplished by welding a 1.5"-2" pipe connecting the 2 pipes of the muffler.

It creates a much deeper and louder sound than stock, similar or better than the PSE.

This can be done by any local muffler shop for about $200.

Just remove mufflers, take them to a muffler shop and show them these pictures, and say: "DO THIS!"

Here are some POST GUNDO HACK PICTURES:

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BTW the "GUNDO HACK" is called that because it was popularized by forum member gundo, after he posted pictures and explanations and decided to do the hack with a larger diameter pipe (2").

Prior it was just called PSE HACK.