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the 3815 will do all gas rams from 98 to I know 07 200 is a very good price thats what I just paid on here for one and I watch ebay for a better deal and it never came along if the tuner was cheap they wanted 50.00$ flat rate shipping. I got mine this morning actually from another person on this forum and it adjusted my speedo for tire size. I was able to lower my shift points and the performance 91 oct is an amazing program it woke the ole girl right up