What is the difference between a Turbo Inlet tubes and and Downpipes

[2020FordRaptor]

Air flows through the turbos in the following manner. Please understand this is excluding the hot side charged air coming out of the turbo, I'm purely talking about intake to exhaust of the turbocharger only. There is much more to this system when you start to discuss the hot side charge pipes, intercooler, cold side charge pipes, intake manifolds, exhaust manifolds, etc.

Cold Air Intake > Boost Tubes > Turbos > Turbo Adapters > Catted Downpipes > Resonator > Muffler > Tailpipes

In short, boost tubes are in front of the turbos and downpipes are on the backside of the turbos.

That said, being that you're in California...there is not current a CARB approved boost tube for your truck. COBB's turbo inlet tubes are in process of obtaining their EO.

I was just going to ask that questions that you just answered. Thanks!

 

[2020FordRaptor]

Do you notice or any proven fact these boost tubes actually increase HP--Just the tubes?

Same question I was going to ask.

 

[2020FordRaptor]

It is dyno proven with tuning.

How about without a tune.

 

[slow_raptor]

I didn't notice a bunch of difference with my AMS inlet tubes and my tune to be honest. I think the improvement came from a bit more of timing and boost and not from the actual tubes.

 

[Nex]

down pipes are the hot side, inlets are the cold side

Like the old McDonald's BLT package.