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So I have a 2010 SRT8 Challenger. I picked up a 6.4 exhaust from the cats back. Right now I'm running SLP Long tube headers and SLP straight pipes. I'm tired of the loud rumble and the constant check engine light being on. Could never get the Tuner to load the tune. So would it be easiest to keep the long pipes and have the 6.4 exhaust welded on, or find the original exhaust manifold and down pipes and do it that way?