[topshelf510]

I wasn't sure where exactly this should go so I just put it on the performance part because I figure its a performance mod anyway. This is my first turbo car and I was just wondering what is the purpose of the down pipe and up pipe(if there is one lol). And obviously, HP gain can be associated with it as well right? Thanks Guys!

 

[iration_sti]

Heres a tad of info as I have had many turbo cars:

The UPpipe is pre-turbo... this is what bolts to the headers

Headers --> uppipe --> turbo

Aftermarket uppipes are typically bigger to allow 20%-30% more flow (especially if the original Uppipe is catted). This allows the turbo to spool quicker (IF it is opened up on the hotside...) this brings us to the DOWNpipe

The Downpipe is connected to the HOT side of the turbo to the catback exhaust.

Turbo --> Downpipe --> exhaust
This is typically a restrictive pipe (also often catted) to cause backpressure on the turbo allowing the stock turbo wastegate to operate fully.

Aftermarket downpipes are typically larger to allow the exhaust gases to escape sooner, causing less backpressure and often resulting in better spool times (especially paired with an uppipe).

This is why catless exhausts are the only thing you see on turbo track cars. You have completely cleared any and all backpressure which allows the turbo to stay spooled at peak and also quicker spooling on acceleration.

For either of these products you most definitely should consider a tune, and have supporting modifications (less restrictive cat-back system and air intake for example) to let the car fully breathe .

Hope this helps?

 

[iration_sti]

and also, both almost always give easy horsepower gains, more air/breathing = more power

 

[topshelf510]

Thank you so much for the info iration sti, now all I have to do is figure out if they're legal in California :question:lol, that sounds exciting, I never knew there was this many performance parts for a turbo car. Too bad I just bought the car so I'm pretty broke :/

 

[Cristobal09]

Unless the DP has a cat, theres no way its going to pass emissions in ca.

 

[iration_sti]

Unless the DP has a cat, theres no way its going to pass emissions in ca.

Exactly,
Unfortunately Cristobal is correct that Catless downpipes almost NEVER pass emissions, I would recommend (when they are released) a High Flow cat (which is still restrictive, but not nearly as bad as stock, especially if the pipe diameter is bigger).

 

[topshelf510]

-__- damn that sucks, thanks for the help guys. Why does cali have to be so strict???? Bast**** lol, I mean I figured. I was Google-ing for a bit and everyone on different forums was saying that DP's are illegal in Cali :/

 

[importmonkey]

Unless the DP has a cat, theres no way its going to pass emissions in ca.

Emissions and gun control in CA are the main reasons I don't want to live there.

 

[iration_sti]

Emissions and gun control in CA are the main reasons I don't want to live there.

Amen!! I happen to like my Beretta 92fs and S&W1911 .45 as well as my fast cars

I spent time in cali when I was a kid, it is beautiful... but I could never live there as an adult. But seems massachusetts is falling down that hole too... eek. South here I come!!

 

[silverarrow27]

-__- damn that sucks, thanks for the help guys. Why does cali have to be so strict???? Bast**** lol, I mean I figured. I was Google-ing for a bit and everyone on different forums was saying that DP's are illegal in Cali :/

Put it this way, 99.9% of performance mods ARE ILLEGAL in CA. If you want to stay street legal then stick with CARB legal parts(rare nowadays) and it doesn't guarantee you'll pass the tail pipe smog either. It just guarantees you that a police officer will not write you a ticket for a modified part on your car.

 

[topshelf510]

Well I had a mildly modded eclipse, and a cop never pulled me over. I even had a LOUD exhaust set up. Even though a lot of performance e parts aren't CARB legal but there is an acceptable amount available. Regardless, I don't have to smog my car for a couple of years anyway

 

[sonofjohn]

Think of this you don't have smog for like 6 years lmao... But you gotta pay to play. If a cop pulls you over and ask to pop good ask for there warrant that allows them to do that otherwise your set on them just being a dick to you for little stuff like tints or something they will try to get something on you since you just pissed them off on not letting them do what they want lol...

 

[topshelf510]

Think of this you don't have smog for like 6 years lmao... But you gotta pay to play. If a cop pulls you over and ask to pop good ask for there warrant that allows them to do that otherwise your set on them just being a dick to you for little stuff like tints or something they will try to get something on you since you just pissed them off on not letting them do what they want lol...

Lmao! That's exactly the way I saw it! I mean 6 years is a damn good time frame to do what I want with the car so that should be fine. And the cops can't make me pop the hood without a search warrant good thinking sonofjohn haha

 

[silverarrow27]

Although the local PD may not be able to search your vehicle, they still can impound your vehicle due to suspicion of driving a modified car. Either way you look at it, they're still making money off of you no matter what.