TRD Exhaust with rear Cat delete?

I have had the TRD exhaust for a year now and while I do like the overall sound, I feel like it could be a little louder. Has anyone removed the rear cats? Does it make a difference? I've seen some vids on youtube but never with the TRD exhaust.

Thanks!

 

Cats are there for a reason. You will not pass state inspection or emissions without them. At best you could replace them with some high flow performance Cats.

 

^this. I would go for a muffler delete before a cat delete. Take off the TRD exhaust and sale on here. Check out @dirtydeeds I'm sure they can provide you more sound without a cat delete.

 

Sensors are after the first set of cats so unless the inspector looks(and knows what he's looking for) its fine. There are many owners that have deleted their rear cats when installing an exhaust system but I can't find one with the TRD system.

 

People also run red lights frequently, doesn't make blowing through red lights "fine" or right to do.

Then do what you want. If you want it louder and deeper you would be better off removing the mufflers and welding in pipe to replace them.

 

an even better suggestion would to to contact @dirtydeeds, they can set you up with an exhaust as loud as you like, even race exhaust.

 

The front cats make much more of an impact on sound deadening than the rear but they're mainly there for emissions. Removing the rear cats might make it a little louder but they're mainly there to prevent smell. I played with both ways on my V8 4runner and preferred no front cats/leave the rear cats for least smell/best sound/performance.

 

This sounds pretty good- TRD exhaust with muffler delete

https://www.youtube.com/watch?v=P8-coYo0_ZM

 

My bet is difference would be minimal. You might notice a little bit but I wouldn't count on it. If you could get rid of all four I would say that would be noticeable. If you want louder, mufflers are the way to achieve that.

 

Thanks for the replies. I will probably just stick with what I have. Maybe I’ll try muffler delete with x-pipe eventually but I’m guessing my kids and wife will not accept!! Lol

 

I've had the mufflers cut out of the TRD exhaust and had a pipe welded in place of it and it is not a pleasant sound. I had it for a week only to go back in to get some carven mufflers put in its place and I am much more pleased with it.

 

I had the only rear cats removed and a straight pipe place in its place on a stock exhaust. It’s only made it slightly louder, most people probably won’t be able to the the difference. I got no check engine light when I removed cats. I still have my mid pipes with only the front cats if any one is interested message me

 

Hello,

Give Keith Carty of Dirty Deeds Industries a call at 760-877-4234. He can get you all set up with the perfect system and answer all of your questions.

Thanks, Shawna, DDI

 

I did a rear cat delete with TRD exhaust and it sounds great. No check engine light and much better than spending 1200+ on a TRD replacement muffler. I can upload some videos tomorrow if you’d like.

this guy did a rear cat delete also and loves it. Hope this helps
https://www.tundratalk.net/threads/wow-rear-two-cats-removed.231274/

 

Correct me if I’m wrong but the secondary cats are more a resonator then a traditional converter. They burn what little if anything the primary cats missed.

The downstream o2’s act more like a sniffer/heater, they make sure the primary’s are working properly.

Thus no check engine lights from removing them, no real world issues, no BS! The caveat are states that require emissions testing , visual inspections and such.

So, removing them will make an exhaust loud. Yes

 

Id like to hear it! Been wondering how it would sound myself and could never find a clip of it.

 

It makes the exhaust louder and ‘slappy’ sounding. It also makes a system which already drones, drone more. Plus, the helicopter sound is still there. And without an X pipe you’re costing yourself low end torque which you could otherwise gain. On top of all that, you’ve just cut up a $5000 set of mid pipes and reduced them to the product of an exhaust shop welded with steel wire.

Your best option is to build a proper Catback, don’t halvazz your $50-$70k truck.

 

I’ve purchased an adapter pipe 07-13 to 14-21 you made, second hand unused and shop welded steel wire is present .Looking at DD’s website this must have been your V1 offering?

An x-pipe changes tone and nothing more, won’t help or hinder flow? Don’t they have studies that have tested exhaust pulse wave and deemed them tone changes to smooth out and change sound?

On the 07-13 systems the tailpipe has a built in resonator, no drone.

 

While I appreciate your point of view, I’m not sure where it’s coming from. I’ve personally tested exhaust systems in tundras for hundreds of hours. An X pipe absolutely makes a difference. If built correctly it gains low end torque, it gets rid of the helicopter sound, and it makes a smoother deeper sound. Having an X pipe versus not is two entirely different trucks.

An X pipe built incorrectly loses low end torque and acceleration. It’s pointless if it’s built wrong. You’re paying money to make your truck slower.

This is not my ‘opinion’ this is fact. I’m not here to argue, or even defend myself. Frankly, your jealousy makes no difference to me, or my posts. My posts are for informational purposes for others reading this. Your mind is clearly already made up.

But for others:

we don’t have a ‘v1 offering’. Depending on when it was allegedly purchased, we may have built it from aluminized steel. But after 2018 we almost exclusively build stainless. We are actually bringing back aluminized steel for the benefit of customers not in high humidity or rust areas because things are ridiculous expensive these days and aluminized steel is slightly less expensive.

The year ranges he is trying to explain is actually 07-09 to 10-21, this is apparently the year range adapter he purchased second hand, supposedly, yet is putting down my work.

It is also worth noting, the resonator in the stock tailpipe is as follows:
07-09 you had about a 30% chance of toyota adding it, 10-13 about a 10% chance. And 14+ it was discontinued by Toyota. This resonator has zero to do with drone. It physically can’t cancel out 130hz. It’s literally the wrong shape, size, and design to even touch 130hz, which is the frequency that our trucks drone. That resonator was put there for high ‘clappy’ frequencies only. Not even sure why this guy brought up a single tailpipe on a thread discussing the TRD dual exhaust. Or my adapter. Or my work.

Also, this person never addresses the fact that a $5000 set of mid pipes is being cut up. That just doesn’t make sense, but based on his post, the point was not to help the OP it was to start problems for a vendor and frankly an OG to modifying tundras since the beginning of modifying tundras.

My original post stands true. If anybody has any questions they would like personal attention to, feel free to call me directly 760-877-4234

Keith
DirtyDeedsIndustries.com

 

Keith, you are a great salesman. My point isn’t to argue at all so I’m not sure why you are on the defensive side about this.

I asked questions as I don’t own a muffler shop or “build” exhaust systems.

Where would someone put an X-pipe properly to make the most, 3-5hp, in a system for a tundra? It’s my understanding that it needs to be after the secondary cats and before the mufflers?

Everything I’ve seen said this will only change sound and tone? Are tundras different?


Do you have any dyno sheets for the x vs h pipe? If so please share.

Is this the V1 adapter?

 

I am not defensive at all, as I’ve already stated, my posts are for the benefit of anybody reading this thread, your mind is already clearly made up. Also, I’m in no way a salesman. I’m an engineer of exhaust systems.

our adapter is made that way on purpose. The flanges are welded to nipples first so that they can be machined smooth after they are warped by welding. Then they are welded to the mandrel bend. A high school kid typically cannot weld with beads that smooth when welding 308 LSI wire thru a mig machine. I’ve interviewed hundreds of welders, including aerospace welders. Only a very small percentage pass the weld test using 308 LSI. It’s a very rare and very difficult wire to work with.

Everything I’ve personally tested shows that an X pipe has better low end torque when properly built. And it kills power when improperly built. In EVERY single uneven firing order V8 with a dual exhaust. Not just a tundra. You don’t test low end torque on a dyno, you test full throttle. Low end torque is part throttle at lower rpm. Nobody physically tests that on a Dyno as you’d need a wooden block under the gas pedal.