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change in 1/4 mile ET?

1683 Views 41 Replies 19 Participants Last post by  crumbie50
Of course I installed LT's and 4:10s blah blah blah... just like everyone else the 4:10s made the biggest difference in ET but the headers ehh not so much. So my question is how much of a difference will a tuner tuned by the right guy make in my ET. Keeping in mind I'm lucky to run a 13.9 lately and has never been tuned.
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If you do not have a tuner what are you using to correct the speedo with the gear change? Usually when people change gears they get a tuner to correct the speedo. That's what I did.
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