Join Date: Feb 2012
Location: stafford, va
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Like I said, it just depends on the kit. If it's a turbo back kit, it'll come with one, you just have to look at the description of the kit. If it's a cat back kit, that's when you'd have to consider upgrading or keeping your stock dp.
If its a 4" kit, its debatable to just buy a bigger dp. If you're looking at a 5" kit, then you prob want to, because you'd have the stock 3" dp opening into 5" pipe.
These are all just my personal thoughts and opinions though, I'm sure someone with some more knowledge on the subject will chime in also.
04 F350 SC LB: Warren Stock+ injectors, Sinister coolant filter, DC Power 185 amp alternator, EDGE Insight CTS w/ EGT, Diamond Eye 5" turbo back straight pipe, S&B intake, MTW Hybrid w billet wheel, Riff Raff boots, Studded, Strokers Unlimited fuel RR system