If you want to be on a first-name basis with every law enforcement officer in your town, remove all the tubing after your catalytic converter.

For your efforts, you'll be rewarded with:
* Very angry neighbors
* Numerous noise violation citations (usually $80-160 each).
* 110+ dB noise from idle to redline.
* Serious and permanent hearing loss from continued exposure to extremely loud exhaust note.

And last but not least...

* 3 to 5 extra hp.

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Seriously reconsider your decision. A 100+ dB exhaust system does little more than piss everyone else off and attract attention from the law enforcement community. Those of us who enjoy this hobby as responsible drivers and upstanding citizens do not wish to be associated with those who care only about making as much noise as possible.

There are plenty of well-built exhaust systems that will accomodate a turbocharger at some point without being obnoxiously loud. The GReddy EVO2 cat-back is a good example of a civilized, effective and legal exhaust.