Catted vs Catless Downpipes | Which Should You Choose For Your STI?

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[BLLx]

I thought my car was Japanese, had no idea it had Cadillac parts. 😮‍💨😮‍💨😮‍💨 so much for JDM.

[ctrlaltelimin]

Your videos are just solidifying me on getting an sti. I have a mk7 golf, and I drove an sti and fell in love. I love the vids man🙏🏽

[nategarcia]

On my 16 STI i went with the invidia catless dp alongside a 38 mm external wastegate to eliminate any boost creep. obviously pro tuned and other supporting mods but the rasp of the catless dp sounds amazing to me.

[jairoaguilar]

Definitely going catted mostly because I want to keep emissions down while making power 👍🏽

[veasnayem]

For the exhaust set up on my 19 STI, I'm running the Tomei catback, Tomei ELH and the Invidia Catless DP and yes, I've seen those stock cats 15+ sti's being sold for a pretty pretty penny. Love the vids bro.

[thatasiandude]

If it's not a track car just go with hi flow cats and viceversa, earthlings will thank you cop's will leave you and you'll have a peace of mind. I think this is the best way to go 👌🏻

[davidnelson]

Thanks for the lesson because I was just wondering the same thing because I have a 2014 WRX Impreza with a EJ 2.5 so that's alot of help

[trnql_noir]

Thanks for the great video. Definitely want to go with the Grimspeed Limited DP

[VIPWRX]

I believe if the car is tuned correctly, catted or not . The car will do what it should do .

[RomanEcheveria]

Got a catless with 44mm ewg, love tge sound of it 😍

[djsthemetereman]

Yessir I'm in Jersey as well gonna be installing a catted downpipe paired with a cat- back valvetronic non resonated exhaust plus Jb4 tune on my 21 Acura TLX TYPE-S, so if I can get it to sound close to these Subarus I'm on the right track

[newguynasti]

Another great video. Been looking at that grimmspeed downpipe or the invidia. Definitely going catted after watching this.

[butterflyeffect]

finally decided to break my hi flow cat couldn't resist the sweeet catless smell anymore

[haydenn_yeung]

cadillac converter lol! jk, love the vids bro!!

[calvinjames]

Apologies for the long message in advance....

I'm new to the STI platform and have a question in regards to the up & downpipe. I have several big HP GM LS & LT vehicles ranging from 630whp to 1, 017whp. So in no way, shape or form am I trying to build this car, but want it to run the way it should once the real tuning starts. I recently purchased this STI to replace my Focus ST, which was my daily. Immediately, the STI became the far more fun to drive vehicle than the ST ever was, and can corner nearly as stable as my CTS-V3. Long story short, the STI ran good with the patches the used car dealership done to sell the car or the previous owner stripped it before selling it because there are signs where an AOS would've been located, or possibly a DP by looking at the broken zip ties.
The car currently has the SRS non muffler axle-back "and sounds great", Cobb Carbon Fiber Intake, and an OTS map. I recently replaced the turbo inlet due to half of it being mounted onto the turbo with the bottom nearly halfway in the turbo itself, so I replaced it as well with a Perrin. Car ran fine for a few days, but the PCV valve that I thought I cleaned up pretty well stuck again. So, it's torn down again at the moment to replace with a new OEM piece. While I have a lot of the shielding off to put new clamps on the turbo drain, I want to know if the DP and UP worth it?
More than likely I'm going to go catted since I don't want it excessively louder than what it is, but wanting to cure the well known problems that exists, along with the weight, and bulkiness in itself.

Is it worth the money, what's the typical whp gains, and overall driveability/reliability of the car afterwards?
As far as the DownPipes, are there any benefits with the divorced DP and the standard DP? At the moment I'll be keeping some type of recirculating BOV. May upgrade once tuning, but don't plan to vent to the atmosphere.

Understand that the FP may have to get upgraded, but hopefully you can tell me yes or no. But the car will not see E85, and only pump 93.... Will the Injectors be enough for those few boltons?

2019 STI Base where I've heard that the 2019 STI will throw 02 sensors regardless. Any info on that? & thank you in advance for any info provided.❤

[VIPWRX]

Tri state, hopefully we don’t turn into Cali

[Mrhiddendeath]

Went with the Invidia catted a little while back because it was on sale and my old Perrin downpipe developed a large crack. Definitely would of got the Grimmspeed for the Gesi and Wideband bung if I were to do it again

[johansgarage]

Thanks for that explanation definitely going catted lol plus don’t want to be too obnoxious

[chucknorris]

I’ve got a brand new Tomei catless down pipe ready to be installed. I will run GS up pipe with EWG and go open source tune.

[ammunation]

Can’t get a p0420 code off even with it tunes so mite just have to go catted unfortunately