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  1. What is difference between 6.1 srt headrs and 6.4 srt headers?

    5.7L Exhaust
    I have a 2015 RT. I bought a complete 2010 SRT exhaust for 400 dollars. It is the stock headers all the way to the exhaust tips. I tried to buy some header bolts but Steve White Motors said that the header bolts are different for a 6.1 and a 6.4. So, what is the difference between these 2...
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