Yes you need a new tune for the increased flow from the headers. You air/fuel ratio will be off. A tune will take care of check engine lights that are associated with long tube headers and o/r mid-pipes. Although it should be okay to drive until you get a new tune. Just try not to do any wide open throttle runs. Running a little lean is alot more forgiving at part throttle then at wide open throttle.
< Message edited by modular81 -- 3/10/2007 10:50:21 AM >
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06 Mustang Gt Premium 5sp Vista Blue,Shaker 1000,18in 64w,IUP,Anti theft Mods JLTII,SCT2 w/B A M A 93oct race tune,Frpp Stingers,Steeda UDP,BBK LT's,X-Pipe,4.10's SS GenII louvers,Painted Mirrors,15%window tint 300rwhp/320rwtq sae 13.18@106
Sounds great!!!!! can really feel the HP gain, Just need to get rid of the Flowmasters and get some Stingers or Loudmouths. THE INSTALL SUCKED ASS!!!!, MAKE SURE YOU HAVE A FIEND HELP. Read my other post on the install.About the retune, I talked to some performance shops and they said, not to worry about a retune, that the LT's would only have a very minimal effect on the A/F ratio.
I got my tune from Brenspeed too, after LT header install I did need a tune update to get rid of a OS2 sensor DTC, and I have the hi flo cats instead of o/r pipe, probably it's a car by car basis type thing,
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Retune after header install - 
RE: Retune after header install - 
