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I have an 08 srt8 too. The stock manifolds are basically shorty headers. Nice cheap upgrade for 5.7s, and I presume the 6.4 as well, factory log style manifolds
Thanks for this thread. I have been thinking of ditching my 16 with 6speed moving up to a 19+ with the 8speed for better towing mpg. But it looks like the towing mpg is about the same. I get ~9mpg pulling my 32ft enclosed with several atvs (~9000) and about 7-7.5mpg pulling our 24ft Boy...