$500?, im looking at doing a full exhaust with-in the next few weeks here and i know that the exhaust is one of the must restricted part on the car, but would i see much of a difference?

 

Should allow the exhaust to flow freer and more smoothly, but I think some guys hold off doing the downpipe at first cause I think it's supposed to be a pita to install.

But if you're doing a full exhaust, you might as well.

There's some good info on the AMS & ETS product pages that might help..

http://www.amsperformance.com/cart/A...-Downpipe.html

http://www.extremeturbosystems.com/E...-Downpipe.html

 

O trust me, it will pull SOOOOOO much harder...you wont regret it, unless its outside of your budget. Then your gna hate yourself until you're hittin the gas in it

 

if your not wanting to do the time comsuming PITA O2 housing replacement, you can get a DP from the O2 housing back... these take about 15-20 min to install (4 spring bolts, 2 each end). the difference is minimal.i did the replacement.... 6 hrs later and pissed off... its done. if you do the O2 replacement, AMS has a write up for theirs but is same for all brands. AMS, ETS, MAP are good choices. rexpeed is cheapest..... but you get what you pay for.

http://www.maperformance.com/evo-x-exhaust-downpipes/

 

The downpipe is a great upgrade, it's a little time consuming to put on. The hardest part is removing the factory downpipe. Once the factory downpipe is disconnected it's a cake walk

 

the o2 housing is the part that makes the difference. The rest of the pipe (what you're referring to here) is worth maybe 1/2 a horsepower


OP, if it's worth it or not is really up to you to decide, it's worth about 10whp (full dp, including o2 housing) on stock turbo. You decide if it's worth the price or not

 

What I've looked around for and not found is whether downpipes with integral O2-sensor housings help with (what I think is called) transient response. Autocrossers - especially not-so-smooth ones like me - go onto and off of the throttle a lot. We try to use our left-foot, instead, but sometimes we can't or just don't. Does a bell-mouth or divorced downpipe help with re-spool or anything else that will get me my power back sooner when I lift? Again, it's low to mid torque that matters to me; I really don't care about the top end.

 

I never noticed a difference in sound or power when i installed mine, same thing when i installed a resinated test pipe. It sounded stock and didnt notice any power gain, however i did cut .2 of my ET at the 1/4 mile with those 2 parts.

 

idk about transient response, but it helps with power a bit down low

scroll down to the 3rd&4th chart

https://www.evolutionm.net/forums/9947059-post14.html

 

Alright thx for the info guys!!

 

yea it will be worth it. i might be selling my perrin down pipe/hfc combo real soon let me know

 

Stock downpipe vs. MAP o2 elim dp (stock turbo/pump gas):



You'll see a majority of the horsepower gains from a 3" shorty downpipe, but not the torque.

 

Thanks for the graph. Still wondering about re-spool, but this is a great start.

 

Yes and yes and yes

 

I'm psycho about spool and response (I used to autocross, haven't recently though...) and noticed no negative effects from the o2 elim dp.