Kfxguy

iTrader: (1)

When I built my turbo setup I had to cheap out on some stuff. One thing was the downpipe. I used a 3” pipe that I had to “massage” with a BFH (big frigging hammer) and smashed it to about 2”. Oval pipe was out of budget at the time. But since then I’ve been collecting parts to do a better downpipe. I ended up getting Cx racing stainless 3.5” oval. Do you guys think I’ll pick up and power or spool faster after I build this downpipe? I need so motivation lol.


Heres what I have:






and here’s what I’m gonna use

ddnspider

iTrader: (26)

If its really 2 inches you probably will pick up power. That said.....I love this video about NA.
https://www.dailymotion.com/video/x3vupq0

Kfxguy

iTrader: (1)

Yea I watched that before. Was really surprised. I figured flow right out the turbo is pretty important and I did what I had to do at the time to get it to work. I always knew in the back of my mind that I’ll end up doing it right or better later on.

panda240ss

i mean is backpressure really needed when turbo? im running maybe 2 feet of exhaust out the fender lol im j.w. not bashing or anything not wondering actually more like asking...

ddnspider

iTrader: (26)

Backpressure is more important on a turbo. People have picked up 30-50whp with just a cutout at the same boost.

panda240ss

So what would be the minimum needed? i was going to do a 3" from the turbo out the fender or hood

ddnspider

iTrader: (26)

Depends on multiple things like c.i., turbo size, pressure ratio, etc. Short distances of piping have less backpressure than a full over-axle exhaust. I had a 3 inch downpipe to a 3.5" over axle with a huge magnaflow muffler and picked up 30whp at the same boost when opening a cutout off the downpipe.

panda240ss

yeahhh....over axle exhaust isnt much of a choice in my setup. sooo....im outtt! haha thanks tho!

Kfxguy

iTrader: (1)

well I answered my own question. I build the pipe a couple weekends ago. Post pics shortly.

Yes It feels like it picked up power, I even had to retune for it.

Kfxguy

iTrader: (1)

I posted this in my build thread too. Pics.

jimmyg

Did you tig all this? Welds look a lot better than the first pipe . I bought a tig welder but haven’t welded anything but thin sheet metal . Dying to try some stainless

Kfxguy

iTrader: (1)

Thx. Yes I tigged it. I’m getting better and they looked really good in some spots. Some spots didn’t look as good because I blew threw due to small gaps in the fitment or I veered a little off course. I really need a better hood but can’t really afford what I need to get, I don’t weld quite enough to justify it.

Btw, after I got this tig machine, I sold my Lincoln mig and Lincoln stick welders. Cheap. $100 each. Lol. I’m dumb.

gametech

iTrader: (1)

I don't think people understood your question. Backpressure is absolutely NEVER needed in an exhaust system. This is an old myth.

Kfxguy

iTrader: (1)

stainless is really easy. I usually fuse it together so i try to make everything fit nice and flush with each other. some people will disagree with the fusing, but I dont care.

1) Ive never had a weld fail because of it
2) I have a welder....so if it does fail...you guessed it....I'll weld it back up!