DeputyDipShizz
Senior Member
I have the 3815 and paid what you did and love it...It does have the MRS elimination...Don't know why yours doesnt
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those that love the 3815 only have the stock tuning to compare it with, so yeah of course you're gonna love it. The 3865 is every bit as much better than the 3815 than the 3815 is better than stock. You've got like 5 features at best with the 3815, and a wholllle bunch more on the 3865. Its a no-brainer to me..
and btw... i use a DSP, so im def not biased.
i get around 14 mpg city 20 hwy with mds enabled if i disable it will gas mileage decrease ?