My old S13 with RSR Ex-Mag, DC Sports headers, 248/248 cam set up, and no cat.
Close up of RSR+DC Sports Header video by ArticDragon192 - Photobucket
My Car :: Dyno2 video by ArticDragon192 - Photobucket
And the power it made
Yes it was loud, but I had an Apexi ECV to control the volume when I was putting around on the street.