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Message: [QUOTE="waynewilson417, post: 1104762, member: 16354"] i'm hoping some folks here may be able to lead me in the right direction to appropriately add some performance i'm looking to add exhaust, intake, tuner, possibly egr delete and dpf delete and possibly some fuel system upgrades as well as far as exhaust goes, one question i have is what size is the stock down pipe? ive been told 4 inches but i'd like to confirm that. as far as exhaust sizing (4 or 5 inch) would i want to keep my exhaust piping the same diameter as my down pipe, and what kind of sound difference would the two sizes have? i would imagine that the 5 inch would probably give a little deeper tone, but i could be wrong i know with intakes that some people are pretty particular about what brands that they use, i am not on of these people. i have been looking at the H&S intake and it seems to offer more flow over stock compared to several Airaid and AFE models that i looked at, but it is quite a bit cheaper than some of the others and i definitely dont want to get a cheap made product. now the big question, deletes or no deletes? my truck is still under warranty but my truck isnt my daily driver. i have a company truck to rack up all the miles on. i drive, on average about 500 miles a month in my personal truck so i'm not to concerned about anything major wearing out anytime soon as i'm very meticulous about my scheduled maintenance. one question that i have with running the deletes is which programmer would be best. of all the research ive done, i've narrowed it down between the mini maxx and the spartan. hopefully there are some spartan owners that can chime in and answer a few questions for me about it. is the spartan capable of clearing my TPMS light and is it capable of calibrating for tire size? does running with deletes really show a big difference in performance? as far as the fuel system is concerned, would the stock fuel pump and injectors be capable of keeping up with either of these programmers on their highest settings? would they be something that i should consider upgrading or are there any other things that i should consider? my main goal out of this is to end up with much better throttle response, adding more "safe" power, and hopefully ending up with a little bit more fuel mileage. 12.5 mpg just seems a little too low to me but i could be wrong. and i'd really like to eliminate the delay that my throttle seems to have. if anyone would be willing to share some helpful knowlege, it would be greatly appreciated. thanks in advance. [/QUOTE]