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Old 11-21-2019, 02:22 PM   #1
siete
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Default 2019 STI Exhaust decisions and tuning

Stock 2019 STI currently.

Invidia catless downpipe on its way to me, shipped today. I will be adding an EL exhaust manifold as well in the near future most likely.

I'd like to go with a titanium exhaust so here's my options:

- Tomei Expreme Ti catback
- Cobb titanium catback
- Invidia dual N1 titanium catback


I like the weight and money savings of the Tomei, though I'm not a fan of the single exit look on this generation, it's not a huge deal. Also... it seems pretty loud lol.

Don't know about the Invidia, but Cobb fitment looks nice. Not not sure about effect of the taper to 2.5" at the Y.

I'll be flashing the Cobb Stage 2 tune and then trying to refine the tune myself with a wideband O2 and Accesstuner Race software. I'd like to cap boost at maybe 15-16lbs, however, I am expecting boost creep with the catless DP from what I've read on the topic. I'll look to see what I can do with the tune to protect against it IF that occurs. Hopefully nothing MAJOR has to be done to the stage 2 OTS maps. I suspect it should be fine, even with Cobb's warning against using the tune with catless DPs.

The EL exhaust manifold will be added a bit later, along with a fuel pump and injectors.... unless it's highly advised to add the pump and injectors along with the exhaust install?

Any opinions which exhaust setup to go with and/or anything regarding the fuel system requirements and tune for the setup?
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Old 11-21-2019, 02:42 PM   #2
WRXnick16
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IMO, all of those exhausts are going to be loud with a catless setup.

The Cobb should be the quietest.. but keep in mind the titanium version isn't resonated. However, you could always weld in a Vibrant titanium resonator (part # 17530)
https://www.amazon.com/dp/B0774TJ8L8/

If budget is of no concern, HKS' Super Turbo tianium exhaust (part # 31029-AF013V) will be the quietest by far and is designed with the ELH in mind (for the EJ207). However, the cheapest you'll probably find it is around $3,600.
https://www.hksusa.com/news/new-supe...rx-and-wrx-sti
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Old 11-21-2019, 03:03 PM   #3
WRXnick16
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Invidia also has the Gemini R400 full titanium exhaust.
https://www.rallysportdirect.com/par...t-back-exhaust
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Old 11-21-2019, 08:26 PM   #4
siete
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Quote:
Originally Posted by WRXnick16 View Post
IMO, all of those exhausts are going to be loud with a catless setup.

The Cobb should be the quietest.. but keep in mind the titanium version isn't resonated. However, you could always weld in a Vibrant titanium resonator (part # 17530)
https://www.amazon.com/dp/B0774TJ8L8/

If budget is of no concern, HKS' Super Turbo tianium exhaust (part # 31029-AF013V) will be the quietest by far and is designed with the ELH in mind (for the EJ207). However, the cheapest you'll probably find it is around $3,600.
https://www.hksusa.com/news/new-supe...rx-and-wrx-sti
Didn't even realize the Cobb titanium wasn't resonated. I still thought that would be the quietest as well.

I know they're obviously all going to be loud with the catless DP, that's fine, but from videos I've seen the Tomei seems the loudest. Although, I cannot find anyone running the Cobb titanium with a catless DP.

HKS seems pretty nice, but that and the R400 titanium are too much money.
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Old 11-22-2019, 12:08 AM   #5
ChongChong
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Quote:
The EL exhaust manifold will be added a bit later, along with a fuel pump and injectors.... unless it's highly advised to add the pump and injectors along with the exhaust install?
I would do your injectors now-I have a full 3 inch catless exhaust and I'm dealing with overboost issues when I'm WOT in higher gears
I'm pretty sure fuel pump, injectors, and an EWG (and a tune of course) will solve this issue.
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Old 11-22-2019, 03:50 AM   #6
siete
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Quote:
Originally Posted by ChongChong View Post
I would do your injectors now-I have a full 3 inch catless exhaust and I'm dealing with overboost issues when I'm WOT in higher gears
I'm pretty sure fuel pump, injectors, and an EWG (and a tune of course) will solve this issue.
Yeah I might just to the pump and injectors now.

I don't want to go with an EWG, just yet anyway. I would try to address the fuel and timing in the higher gears for any boost creep first.
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Old 11-22-2019, 10:40 AM   #7
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I suggest with pump and injectors, I am currently struggling with boost creep, trying to get an ewg set up installed, which I currently dont have the time for so im sourcing out local shops that know and can do it for me. I have a full invidia turbo back exhaust, I got an invidia N1 Dual burnt tips and a high flow catted invidia bellmouth downpipe. The car is fairly loud, from stock to my TBE setup, if stock is 0, I would say 6-8/10 depending on if you're WOT or not, it's enough to get you followed around town by cops, and I mean followed and my area has a whole lot of straight piped trucks and a few other cars and I feel like I get their attention more often than they do.
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Old 11-22-2019, 04:01 PM   #8
siete
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Quote:
Originally Posted by STiSilly View Post
I suggest with pump and injectors, I am currently struggling with boost creep, trying to get an ewg set up installed, which I currently dont have the time for so im sourcing out local shops that know and can do it for me. I have a full invidia turbo back exhaust, I got an invidia N1 Dual burnt tips and a high flow catted invidia bellmouth downpipe. The car is fairly loud, from stock to my TBE setup, if stock is 0, I would say 6-8/10 depending on if you're WOT or not, it's enough to get you followed around town by cops, and I mean followed and my area has a whole lot of straight piped trucks and a few other cars and I feel like I get their attention more often than they do.
Thanks STISilly, good info. Interesting you're getting boost creep even with the catted DP.

I'm leaning towards the Cobb at this point. The dual N1 seemed to have the lowest frequency tone of them, but not necessarily the most quiet. I can't really tell from videos though. I can tell they are louder for sure, as I would expect, but that seems significantly louder. That's alright with me.
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Old 11-23-2019, 08:08 PM   #9
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Better go with a EWG if going to a catless downpipe on the ej257 platform or your going to be chasing boost. I'm running Carven on my 19 sti and Love it!
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Old 11-23-2019, 11:36 PM   #10
siete
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I may just go with the Cobb stage 3 package and use the maps to get close.

It's expensive and I don't care to run their fuel rails/lines; FPR or the SF intake, but it gives me the pump, injectors, and exhaust system with the AP and a decent tune. Of course, I would use everything in the kit if I get it.

It should get me close to where I need to be without worrying that I'll screw something up. I'm a little nervous about setting up the injectors from scratch and not sure how involved it is. I have to research it more.
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Old 11-25-2019, 01:02 AM   #11
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Quote:
Originally Posted by siete View Post
I may just go with the Cobb stage 3 package and use the maps to get close.

It's expensive and I don't care to run their fuel rails/lines; FPR or the SF intake, but it gives me the pump, injectors, and exhaust system with the AP and a decent tune. Of course, I would use everything in the kit if I get it.

It should get me close to where I need to be without worrying that I'll screw something up. I'm a little nervous about setting up the injectors from scratch and not sure how involved it is. I have to research it more.

If you go stage 3, I also suggest going for an e-tune right away, wayyyyy better than cobbs maps, cobbs stage 2 tune for me was like a base tune. I knocked on WOT real bad, down to a -6 on WOT, granted I wasn't using cobbs jpipe but it still scared the crap out of me haha. The hardest part about installing everything IMO is the teardown. Reinstalling aftermarket parts is sooooo much easier than taking the stock stuff off.
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Old 11-25-2019, 03:57 AM   #12
siete
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Quote:
Originally Posted by STiSilly View Post
If you go stage 3, I also suggest going for an e-tune right away, wayyyyy better than cobbs maps, cobbs stage 2 tune for me was like a base tune. I knocked on WOT real bad, down to a -6 on WOT, granted I wasn't using cobbs jpipe but it still scared the crap out of me haha. The hardest part about installing everything IMO is the teardown. Reinstalling aftermarket parts is sooooo much easier than taking the stock stuff off.
Yeah that would scare me too lol.

One of the main things I'd like to do is learn how to tune myself though, which is why I thought adding part by part and then tuning would be nice, instead of just slapping a "stage whatever" package on. I was assuming not much would be needed to refine the tunes on my own after logging with the OTS base maps. I'd also like to keep as stock as possible. So the intake, WG, FPR, fuel rails; I don't see the need for that. I simply want the turbo-back, EL exhaust manifold, and fuel pump with injectors for now. If I wanted more after that.. I'd look to a better turbo. I don't want to push it too much on a stock motor.

I'm coming from carburated American V8 engines, so this is new to me. Although with the cars I'm used to, I found the opposite is true... Getting parts off was easy, getting the aftermarket parts to fit and work was the bitch in most cases.

Last edited by siete; 11-25-2019 at 04:06 AM. Reason: Edits
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Old 11-25-2019, 04:43 PM   #13
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Quote:
Originally Posted by siete View Post
Yeah that would scare me too lol.

One of the main things I'd like to do is learn how to tune myself though, which is why I thought adding part by part and then tuning would be nice, instead of just slapping a "stage whatever" package on.
Doing the tune yourself can be rewarding, just make sure you know what you're looking for in the logs. I recommend the hpacademy.com course if you want to learn the ins and outs of tuning before attempting this.

Also keep in mind, you'll need to pay and take the Cobb course before they will provide you with a copy of AcessTuner.
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Old 11-25-2019, 08:22 PM   #14
siete
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Quote:
Originally Posted by MikeG4936 View Post
Doing the tune yourself can be rewarding, just make sure you know what you're looking for in the logs. I recommend the hpacademy.com course if you want to learn the ins and outs of tuning before attempting this.

Also keep in mind, you'll need to pay and take the Cobb course before they will provide you with a copy of AcessTuner.
Thanks for the link, wasn't aware of that site. Yes I know Cobb requires you take a course for AT Race software; that's no problem.
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Old 11-29-2019, 09:23 AM   #15
siete
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When would the Cobb fuel rails/lines/FPR be necessary?

They claim the FPR kit fixes a 2800rpm stumble in the 08+ STI.
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Old 11-29-2019, 10:45 AM   #16
wrxlaunch
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Quote:
Originally Posted by siete View Post
Stock 2019 STI currently.

Invidia catless downpipe on its way to me, shipped today. I will be adding an EL exhaust manifold as well in the near future most likely.

I'd like to go with a titanium exhaust so here's my options:

- Tomei Expreme Ti catback
- Cobb titanium catback
- Invidia dual N1 titanium catback


I like the weight and money savings of the Tomei, though I'm not a fan of the single exit look on this generation, it's not a huge deal. Also... it seems pretty loud lol.

Don't know about the Invidia, but Cobb fitment looks nice. Not not sure about effect of the taper to 2.5" at the Y.

I'll be flashing the Cobb Stage 2 tune and then trying to refine the tune myself with a wideband O2 and Accesstuner Race software. I'd like to cap boost at maybe 15-16lbs, however, I am expecting boost creep with the catless DP from what I've read on the topic. I'll look to see what I can do with the tune to protect against it IF that occurs. Hopefully nothing MAJOR has to be done to the stage 2 OTS maps. I suspect it should be fine, even with Cobb's warning against using the tune with catless DPs.

The EL exhaust manifold will be added a bit later, along with a fuel pump and injectors.... unless it's highly advised to add the pump and injectors along with the exhaust install?

Any opinions which exhaust setup to go with and/or anything regarding the fuel system requirements and tune for the setup?

Does Cobb have a Map for the S209? Why only 15-16 PSI?
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Old 11-29-2019, 10:53 AM   #17
siete
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Originally Posted by wrxlaunch View Post
Does Cobb have a Map for the S209? Why only 15-16 PSI?
I don't see one for the S209.

From Cobb:
Stage 2 map Boost Targets: ~18.5psi (S#), ~16.0psi (S) or ~9psi (I) peak boost pressure, +/- 1.0psi.

I think I should be fine with 16psi and prefer not to run higher boost than that at first with the catless DP and whatever cat-back I go with. Hopefully with exhaust and the injectors/pump and can get ~300-305whp with a tune.
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