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I have a mail order tune from MD currently and right now my car is at Strictly Performance in Houston having longtubes installed. I am wondering if I will need a retune after the headers or if I will be okay to go. They are going to dyno it for me, should I be able to tell from the graph if all is well? Or will it be more like driveablity issues that I couldn't see on the dynosheet? They only use Diablo Software, so if I need a retune I will either need to have to buy a Diablo from them, which sucks since i just bought my Xcal2 about 3 months ago, or I will have to get an updated mail order tune from MD. What is everyone's thoughts on the issues? Let me know what you guys think asap, I pick the car up tomorrow at lunch.

Thanks,

Jason
 

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If the longtubes move your O2 sensors from the stock position (which they most likely will), you'll need to get a retune.
 
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