3" exhaust.... less than $100 (BLAM...theres your 13 and then some *applause in the background* thank you, thank you....Ill be here all week
OR you could just go buy a Camaro or Firebird and start driving a 13 second car

It is usually a bit easier and cheaper to start with a fast car and make it faster opposed to making a quick car fast.
And we "V-8" guys have a lot to learn?