Has anyone had any experience with an open exhaust. I am working on building a test pipe to replace my cat and was thinkng of adding an exhaust cut out to the test pipe so I could open it up at the strip.

this is what I'm talking about... http://static.summitracing.com/globa.../big-53026.jpg

What's you're experience if any with an open exhaust on a N/A 4 banger?