I am looking forward to installing the downpipe/Plog or headers, and 3.4 pulley and tune. That should get me into the high 13's.......MY liquifire was completely stock......not so much for suspension in those days...motor was actually fairly quick for its day......so slow by todays standards though.......good luck. Not sure what the capabilities are with the Diablo.....no experience with it. If you could get a code it would help tremendously.