no tune needed on shorty headers, i would throw on a new cold air intake at the same time, you would need a tune for the intake, brenspeed can take care of that for you. you know the shorty's may give you 8-10 hp and a better exhaust note, a cai wiith tune could be 20+ HP
the best shorties have provided less than 2rwhp. its a fact that the stock shorties on our cars outflow the stock headers on a 03/04 cobra. You should save your money on the shorties and put it towards something more useful
No it's not needed, the easier your exhaust evacuates from cylinder the more combustable air comes in to the cylinder...any tune you have will compensate for that, long tubes is different story because scavanging occurs at a lower point in the exhaust system.