The author of that article describes the Cobb carted downpipe as one of the best power mods available, yet I've read multiple times on these forums that aftermarket downpipes yield absolutely no power gains when paired with stock turbo.
I'd be interested for someone to settle this once and for all. What, if anything, can be expected in terms of power gains from an upgraded downpipe?
It seems like the author indicated that the new DP might not have necessarily added new horsepower, but it allowed for the maximum horsepower of the engine to be applied much more quickly via faster turbo spool. Is this accurate?
Hi there, author of said article here.
I haven't really been on the forums the past 8-9 months while I've been getting my ST running right again so I'll go ahead and address this.
At the time I wrote this, that's what the understanding was; only recently have people like Peter figured out you can make almost the same power with the stock downpipe and enlarged inlet/outlets.
What's more, even getting a downpipe in the USA at all is getting very very hard. I can't even sell you one in CA anymore, I don't think - things have gotten VERY hard for the aftermarket in the last month or so. Environmental agencies are nailing the entirety of the aftermarket and have hit basically every shop in SoCal and are working their way across the USA.
With a catted downpipe, I noticed a definite difference in how the car delivered its power, but like I said, I've been out of the game for a while as I've been fixing what broke, and to be frank with you, I've been avoiding going here because it made me depressed and sad because for eight months I made payments on a broken car.
The article will be revised again soon, there are certainly some new things to be explored - when I first wrote this, the car was barely even out and as such, we've learned more as a community.
I'm getting back into R&D for Fiesta stuff personally so i have more of an idea of where things are at now and some of the new developments in the scene.
Over the past two weeks, I figured out how to shove that bigass Wagner Tuning stepped core FMIC into the car without cutting the crashbar of a USA car, and without cutting the bumper or anything.
My current setup is stock tune, wagner FMIC, muffler delete w/stock downpipes and catback, modified injen Intake mated to OEM airbox, revised, SEALED ducting for just two inlets on the airbox. The stock downpipe seems to be making good power with the muffler gone, which leads me to believe that's probably the only real restriction with the stock turbocharger.
Since I wrote the article we know a lot more about turbochargers, records have been made and broken; we know the car can make power into the 400's if you wanna get crazy with ti