OEM downpipe vs. OTT High Flow Catted Down Pipe - side by side comparison

[Big Dawgs Toyota Tuning]

Here's a couple quick pics of the OEM downpipe and OTT High Flow Catted Downpipe (@JustDSM) next to each other.

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[RutsyBucket]

What sort of gains? I imagine quite good when tuned. Also, at what point are you guys requiring 91+ rather than recommending it? I would assume once you do this?

 

[Big Dawgs Toyota Tuning]

What sort of gains? I imagine quite good when tuned. Also, at what point are you guys requiring 91+ rather than recommending it? I would assume once you do this?

I haven't had the truck on a dyno yet, but will at some point. Will probably have our 4R on there as it's still stock so I'm curious what kind of numbers that will put out.

 

[Wife bought my 24 TRD]

Here's a couple quick pics of the two next to each other.

Where are all the tabs, or are those for the stock heat shields? All the sudden they are not needed anymore?

 

[lauren01]

The moment my warranty expires….

 

[Big Dawgs Toyota Tuning]

Where are all the tabs, or are those for the stock heat shields? All the sudden they are not needed anymore?

The stock heat shield isn't needed for this DP. If you want the extra heat reduction, there is an optional upgraded insulated stainless thermal shield you can request.

 

[TimC.]

I have a question. How robust is the flex joint in the pipe? Is there a concern that this area will separate over time with heat cool cycling? This is a really nice upgrade.

 

[ScottyMcfly]

Damn, I want !!!!!

 

[tipsyjam]

Sup Big Dawg got some questions, does the oem exhaust front pipe connect to the new downpipe using the same donut style gasket like it does from the factory, or is it a different style gasket? I see the donut gasket still on the outlet of your old downpipe in the picture. I was curious how your exhaust bolted up to the new downpipe as there doesnt seem to be a lip for the donut gasket to sit on the aft side of the downpipe outlet flange.

I dont see welded nuts on the forward side of the outlet flange of the new downpipe, so is it the oem spring bolts going from the aft side of the front exhaust pipe flange into new nuts on the forward side of the downpipe outlet flange, or is it different fasteners that are used? If not spring bolts, is there any effort made to stop the fasteners from vibrating loose such as a spring lockwasher + washer combo?

How does the downpipe connect to the turbo? Is it still with the band clamp and knock pin like oem? I see a hole on the turbo side flange that looks like the knock pin hole but wanted to confirm as the flange shapes are different between the two.

Were you provided instructions from OTT for install and final torques, or were you able to pretty much stick to the repair manual procedure from TIS and just perform applicable steps as you go? For example, the new downpipe doesnt have a stay bracket to bolt to the engine/transmission so you would just skip that step.

 

[TacoKiwi]

Downpipes make the driver feel good unless a corresponding tune is installed. Same with $$ for exhaust and for intake filters and airboxes. IE you have to void your warranty to take advantage of these mods. The only way to get warrantied power is to always travel downhill.

 

[JustDSM]

Sup Big Dawg got some questions, does the oem exhaust front pipe connect to the new downpipe using the same donut style gasket like it does from the factory, or is it a different style gasket? I see the donut gasket still on the outlet of your old downpipe in the picture. I was curious how your exhaust bolted up to the new downpipe as there doesnt seem to be a lip for the donut gasket to sit on the aft side of the downpipe outlet flange.

I dont see welded nuts on the forward side of the outlet flange of the new downpipe, so is it the oem spring bolts going from the aft side of the front exhaust pipe flange into new nuts on the forward side of the downpipe outlet flange, or is it different fasteners that are used? If not spring bolts, is there any effort made to stop the fasteners from vibrating loose such as a spring lockwasher + washer combo?

How does the downpipe connect to the turbo? Is it still with the band clamp and knock pin like oem? I see a hole on the turbo side flange that looks like the knock pin hole but wanted to confirm as the flange shapes are different between the two.

Were you provided instructions from OTT for install and final torques, or were you able to pretty much stick to the repair manual procedure from TIS and just perform applicable steps as you go? For example, the new downpipe doesnt have a stay bracket to bolt to the engine/transmission so you would just skip that step.

Not to step on @Big Dawgs Toyota Tuning 's toes, but I can answer some of these questions for ya!

Our downpipe has a custom V-Band flange with a locating hole for the alignment dowel on the turbine housing outlet flange. This helps ensure proper orientation and alignment during installation. The V-Band flange we use also allows us to retain the OE V-Band.

At the other end of the downpipe, where it meets with the exhaust mid-pipe, we have a custom flange which eliminates the need for the OE doughnut gasket, allowing us a full 3" outlet at the rear of the downpipe. This custom flange will mate to a OE mid-pipe or aftermarket one such as the AWE using a custom gasket we supply with our downpipe. We also supply hardware that eliminates the OE fasteners and springs, so you can securely fasten the mid-pipe of your choosing to our downpipe. Should you wish to make a custom exhaust, we can also supply a custom flange that will match our downpipe, allowing you to create a full 3" system if desired.

As for retention, we've not had any issues, as the addition of the flex coupler in our downpipe isolates the rear flange. When properly torqued (we provide the hardware and torque specs), you should not run into any issues.

Installation instructions are provided.

 

[Big Dawgs Toyota Tuning]

I have a question. How robust is the flex joint in the pipe? Is there a concern that this area will separate over time with heat cool cycling? This is a really nice upgrade.

I have zero concerns on this. The quality is great.

 

[Big Dawgs Toyota Tuning]

Downpipes make the driver feel good unless a corresponding tune is installed. Same with $$ for exhaust and for intake filters and airboxes. IE you have to void your warranty to take advantage of these mods. The only way to get warrantied power is to always travel downhill.

Dude, I tuned my vehicle with 11 miles on it in the dealers parking lot, I also installed an upgraded turbo with less than 10k miles on it. I am not concerned in any form or fashion with what the dealer has to say about my truck or what they think they can deny for my warranty.

 

[Big Dawgs Toyota Tuning]

Not to step on @Big Dawgs Toyota Tuning 's toes, but I can answer some of these questions for ya!

Our downpipe has a custom V-Band flange with a locating hole for the alignment dowel on the turbine housing outlet flange. This helps ensure proper orientation and alignment during installation. The V-Band flange we use also allows us to retain the OE V-Band.

At the other end of the downpipe, where it meets with the exhaust mid-pipe, we have a custom flange which eliminates the need for the OE doughnut gasket, allowing us a full 3" outlet at the rear of the downpipe. This custom flange will mate to a OE mid-pipe or aftermarket one such as the AWE using a custom gasket we supply with our downpipe. We also supply hardware that eliminates the OE fasteners and springs, so you can securely fasten the mid-pipe of your choosing to our downpipe. Should you wish to make a custom exhaust, we can also supply a custom flange that will match our downpipe, allowing you to create a full 3" system if desired.

As for retention, we've not had any issues, as the addition of the flex coupler in our downpipe isolates the rear flange. When properly torqued (we provide the hardware and torque specs), you should not run into any issues.

Installation instructions are provided.

Yeah, what he said. Package came complete with instructions, torque specs, upgraded hardware, and a gasket.

The best part was the envelope that said, "parts inside, don't bend." Lol

 

[Big Dawgs Toyota Tuning]

Damn, I want !!!!!

OTT is just an email away for an order to be placed.

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