Catted Vs Catless Downpipes + The Issues With Boost Creep

Me who has n/a subaru: "Yes, boost creep, problem noted 👁👄👁"

I feel it’s important to point out that while a catalytic converter does reduce CO emissions, the main purpose of the design is actually to reduce smog emissions. Smog is a catch-all term for oxides of nitrogen (NOₓ) which are a medley of molecules formed during combustion which consist of a nitrogen atom bonded with various numbers of oxygen atoms, hence the ‘x’ in the name. The key to the cat’s function lies in bond energies of molecules, and the triple covalent bond in NOₓ molecules have much a much higher bond energy than the double bonds in CO, CO₂ O₂, N₂, and other common exhaust products. To remove the NOₓ molecules, the cat media reacts with the exhaust gas by becoming extremely hot, reaching temperatures comparable to the combustion chamber where the NOₓ was formed. Since it takes the same amount of energy to break the bonds as it does to form them, the NOₓ molecules disassociate into monoatomic nitrogen and oxygen as they pass through, and when they exit the cat the temperature drops below what would be required for NOₓ molecules to re-form. The result is a significant decrease in smog emissions and the presence of smog is the smell the emits from a cat-less setup.

This channel is quickly becoming my favorite. Love the channel man I've learned so much new wrx owner here. Its my first Subaru so i wanna do it right. Thanks for the great content!

I dont have a cat I have a dog, does that make me...catless

Bro I love this channel so much. The way everything is explained is super clear and informative. I seriously hope your success comes because it is beyond deserved.

bought my 2012 in December and your videos have shown me that the original owner and his tuner did my car right. Thanks for all the great Subaru info

We have a subaru WRX. This was very informative. We appreciate the breakdown. This cleared up alot of questions we had.

Catted downpipe to keep it friendly with our neighbors😂

Yessss - I really wanted this topic. Thanks for doing this ❤️

Perfect video. Thanks! Just boosted my miata and noticed I was running lean at higher RPM's. I also noticed the boost was increasing from where I had it set. I installed a test pipe while installing the turbo system... but I'm thinking the cat is going back on. Thanks for explaining everything!

Been looking for info on this topic everywhere. Dropped a sub. Keep it up!

Love this guys’ videos keep it up man !!!

scrolling through sti vids for my sti and i see the TMG banner in the back. Much love brother!

All of your older videos are very entertaining brother. Have a great week.

Its also important to note what hardware comes in the box with certain downpipes. Sometimes a cheaper downpipe will be missing a gasket or resuse bolts that were already on the car instead of new hardware.

Best wrx channel out there ,, been watch and subscribed at 771 and Anything I need to know I watch your videos keep it going

Love this video, I’m new to the subi community and I’ve learned so much, thank you!

The intro alone got me😂!! Very informative altogether 🙌🏽😎

Loving the videos man! I have owned a 2015 sti for 3 months now, went from a 99 GC8 NA to this and am so happy with it, your videos are very helpful for me and your great at explaining I can tell you know best!. Respect from Perth Western Australia 🇦🇺

Appreciate your channel. As a 2005 Subaru Legacy GT owner, its helped me understand ALOT. Kudos