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The downpipe is the exhaust pipe that comes out of the turbo and goes down to the exhaust. If it's about the size of a Coke/Pepsi can it's 3" which is stock. Also, the 4" usually is 3" at the turbo, and then flares out to 4" in the first 4-5". So if it stays the same size, it's probably stock 3", on a 12 valve truck.
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'96 2500, CTD, 4X4 flatbed, Isspro gauges, Skyjacker D-25's, ThurenFab track bar, DSS, HD steering.
Good job explaining that Racer 9 It is very easy to tell once you know what your looking at! There is a huge gain going from stock to 4". Dont know if you have a pyrometer but the hot gasses will flow a heck of alot faster
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'05' 3500 4x4 Laramie Dually AFE Intake and 5" stainless exhaust , Ranchand bumpers front and back, leveled on 35" AT2's
Nope...what I meant was, intake and exhaust are just the beginning to dumping way to much money into performance mods . EGT = Exhaust Gas Temperature...when you start turning the pump up, etc, you'll increase combustion temps and too hot will result in melting things. A higher flowing exhaust (ie, 4") will allow air out faster and subsequently lower temps.
Nope...what I meant was, intake and exhaust are just the beginning to dumping way to much money into performance mods . EGT = Exhaust Gas Temperature...when you start turning the pump up, etc, you'll increase combustion temps and too hot will result in melting things. A higher flowing exhaust (ie, 4") will allow air out faster and subsequently lower temps.
Ok, I'm with ya...I knew turning up the turbo (chip/tuner, etc) required larger exhaust, but can you get performance out of a 4" down pipe w/o any other mods?
Ok, I'm with ya...I knew turning up the turbo (chip/tuner, etc) required larger exhaust, but can you get performance out of a 4" down pipe w/o any other mods?
You won't gain any power, you might recover a little that is lost in a restrictive exhaust system, and it will help the motor breathe better, and run cooler.
You cannot "chip/tuner" a 12 valve. It is an all mechanical motor, which means all power upgrades require getting a little grease on your hands, and working up a little sweat. The plus side is that's all some of the upgrades require, in other words, FREE power.
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'96 2500, CTD, 4X4 flatbed, Isspro gauges, Skyjacker D-25's, ThurenFab track bar, DSS, HD steering.
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. EGT = Exhaust Gas Temperature...when you start turning the pump up, etc, you'll increase combustion temps and too hot will result in melting things. A higher flowing exhaust (ie, 4") will allow air out faster and subsequently lower temps.
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