Sub-Zero Equal Length Y pipe.

As always, I would love to cater to all. It’s just not always feasible to do so. But we always do our best to try.

The high clearance is going to be a full system. Just no way around that. So it will remove the secondaries. But I will say, I have several Y-pipes in the strictest states in the country. It’s just a matter of swapping things around for inspection. A pain, I know. Just have to weigh the pros and cons on a personal level.

On a second note to all, I have changed things a bit and made it so all orders are final. We have had far too many change their minds on coating a week or more into the order. We handle things differently when we know they are getting coated. Basically the tube finish is not held to the same standards when they are being coated as it does not matter how good the bushed finish is.

I hate having to set boundaries like this, but I don’t have much choice. Please make sure you are selecting options you actually want when ordering!

On a 3rd note. Supply is absolutely becoming an issue. Eventually we may be required to extend lead times as we are already having trouble maintaining the times posted. Hopefully this issue corrects its self sooner than later.

We hope everyone is doing well!

 

I totally understand and there won't be any hard feelings if you never do it but I may keep pestering you to take my money in case things get slow and you decide to do it

I have replaced cats and exhausts before and I just can't bring myself to do that every 2 years.

 

For those swapping their Y pipes come inspection time how much work is it really?

When the high clearance 3rd gen option becomes available how much work do you think it will be to swap that back to stock come smog test time?

 

Personally, I could have a full exhaust including the Y swapped out in less than an hour with either variation. If you’re careful you shouldn’t even need new gaskets.

 

Hello everyone,

Could someone who has installed the Y pipe provide any feedback? I have the OTT Tune, and I am curious if you experienced any issues with CELs or felt any torque difference. I have already read all 40 pages of this thread, but I would appreciate any additional insights from someone who has installed the Y pipe.

Thank you in advance for your assistance.

 

What generation truck do you have?

 

Mine is a 3 gen

 

A few guys have commented on the results it provides. There is a noticeable difference with them. But as the creator, I understand my word may not be super meaningful to someone potentially looking to buy.

 

I am really interested because I like the tone it produces. I asked some OTT tuners if it would need any recalibration, and they told me no, but their response was not encouraging in terms of pulling the trigger on the pipes.

 

All I can tell you is it is good for some gain. And gain most everyone has noticed immediately after install. Based on data logs, it shows an approximate 10hp gain. But I’m not the guy that’s going to try and sell you on it. Even though, I’m the guy making them.

We feel the biggest gains come in the mid range area/highway cruising. I personally feel it would compliment the OTT tune well.

I have not had anybody tell me they regretted the purchase to date.

 

Awesome, I'm sold on the sound alone! Just one last question: the picture makes it look like the tubing is running closer to the transmission oil pan. Do I need to add a heat shield there?

 

You can if you want to. But we have seen no negatives thus far. With trans temps. If you ran a skid, then I would do everything possible to reduce the heat.

 

All buttoned up! Like how it’s tucked up close and not hanging down like the stock Y. Have about 200 miles with it and had no transmission temp issues monitoring via a scanguage.

 

I am fairly certain the only reason an OTT tuner discourages the install of a catless Y pipe of any kind is because their tune is CARB certified, and therefore they cannot condone the use of any emissions device deletes in conjunction with their tune. They had no problem with aftermarket Y pipes prior to the CARB status.

 

This is correct. One of those things you just don’t mention when getting a tune.

This is where I’ve been confused with @JustDSM wanting a Y pipe to test. Which I’m happy to do if it helps me, but can confirm the tuners aren’t supposed to condone or even tune a truck that has had emissions modified.

 

I'm pretty sure @JustDSM was offering to use the dyno he has available to him with only the “stock” tune. No tuning!

 

Let’s clear up a few things before speculation gets mistaken for fact.

First and foremost, Overland Tailor Tuning (OTT) is a data-driven company. We invest significantly each year into testing and development, and if you’ve followed my post history, you’ll know I’ve shared an unusually high volume of data and technical insight with this community—most of it on my personal time and dime. While some of our findings are shared publicly, a substantial amount of testing is conducted for internal purposes only.

When someone contacts OTT for feedback, we aim to provide an honest, tailored response based on their goals, budget (if disclosed), and use case. We do not get into granular specifics, and our guidance is not influenced by our EO (Executive Order) or CARB status. Our position is simple and consistent: OTT tunes only emissions-compliant vehicles. That decision was made by the owner very early on—well before any CARB certification was secured.

We’re not here to argue, debate, or interpret regulations to suit different viewpoints. This is the stance OTT has taken, and it reflects our long-term commitment to remaining compliant with both federal and local emissions laws. The risk of fines and legal issues from tuning deleted vehicles far outweighs any short-term financial gain. It’s just not worth it—ethically, professionally, or legally.

Now, regarding the Y-pipe testing mentioned earlier: that offer came from me personally—not OTT—and it was a gesture of goodwill. I offered to run your Y-pipe on the dyno (not on public roads) using a stock calibration. The intent was to generate real, unbiased data on your product’s performance—free of charge—because I genuinely appreciate the craftsmanship and the support you're offering to others in the community. As you may recall, I’ve even shared summary-level data with you previously on similar products and configurations.

As @1slow4.0 rightly pointed out, testing would be done strictly with an OEM calibration. This ensures consistency and removes any perception of tuning bias, while also enabling apples-to-apples comparisons with other 1GR-FE configurations I’ve evaluated and posted about.

Hope this helps clarify things.

*Edit* - For what it’s worth: at the 370 wheel horsepower level on a 3rd Gen, an equal-length Y-pipe combined with a straight-through 3" cat-back was worth 8 additional wheel horsepower on the dyno.