Sr no cat and exhaust and you won't have a problem shooting flames.
My SR used to do it ALL THE TIME!! until I found out is was running way to rich.
Not it does it everyonce in a while when shifting at high rpm with an atmosheric BOV. Reason is because during shifts the air is released by the BOV causing a rich conditition. Chickeys dig it. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/laugh.gif" border="0" valign="absmiddle" alt=':laugh:'>
You don't really need any mods. Just a turbo motor or a way to make your motor run rich.
PS. That pivot misfire gimmik is crap. In order to shoot flames you have to set it at a low rpm. It's rpm dependant not shift dependant like a real misfire system therefore rendering it nothing but an overprices two stage rev limiter.
Jed