Hmmmm, based on this pic, it looks like these would fit the X, I was switching out my widebands and there was a lot of room between the manifold/converter and the prop shaft/front diff. The fact that the X and RWD use the same manifold makes me think this is a fit. By chance, do you have any other pics looking underneath into the engine/cradle?
Yea I did this already, I don't like how it sounds, so it's either drop the engine, make a jig and replace the hollow cat section or buy these and hope for the best.seymore4 wrote: ↑Thu Sep 02, 2021 5:38 pmWhen I ordered mine in March that's what I was told, direct from the head honcho. And after installing them myself I don't know how they would be able to make a set for the AWD models. It is very, very, very tight.
If I had an X I would just hollow out the primary cats and get the rest of the exhaust made custom, that will give you a substantial performance boost and save you a lot of money.
I already removed the secondary cats and installed custom exhaust with an x-pipe. I also have the HPS tubes installed. Thought this would be a great way to add even more power.seymore4 wrote: ↑Thu Sep 02, 2021 5:38 pmWhen I ordered mine in March that's what I was told, direct from the head honcho. And after installing them myself I don't know how they would be able to make a set for the AWD models. It is very, very, very tight.
If I had an X I would just hollow out the primary cats and get the rest of the exhaust made custom, that will give you a substantial performance boost and save you a lot of money.
Yes installing the headers will trigger those codes. Whether or not you decide to go with aftermarket cats, you will need to have it tuned to adjust your A/F ratios. Not sure about the VK56VD, I know a tune can also be adjusted to keep the CEL from coming on if you decide to leave the cats off on the LS platform.Big_Tone wrote: ↑Sat Mar 19, 2022 3:57 pmI followed up with PPE again and was told they’re working on headers that will fir the M56x. Sounds like they will have them this year. The PPE header doesn’t include cats, so you’ll either connect to the secondary cats (if you still have them) or get aftermarket ones. I removed my secondary cats, so option 2 is what I’d have to do. This also appears to be what’s in the video review. I noticed that the CEL was on. Is that due to the cats or something else? I need to pass emissions, so if this mod is going to throw the P0420 or P0430 then I can’t do it. Anyone know if this would be the case?
Ok thanks! My plates renew in July and I’m not sure if I’m going to have to test again (just did last year). I’m trying to keep track of everything I’ll need if I do this. My CEL just came on a couple weeks ago. I had just bought some gas that I think was cheap, so I bought a cleaner and cleared the code. So far, so good, but at 122k miles I know it’s inevitable that the cats have to get replaced. Trying to gauge the cost between this option and OEM.armybrat wrote: ↑Sun Mar 20, 2022 9:47 amYes installing the headers will trigger those codes. Whether or not you decide to go with aftermarket cats, you will need to have it tuned to adjust your A/F ratios. Not sure about the VK56VD, I know a tune can also be adjusted to keep the CEL from coming on if you decide to leave the cats off on the LS platform.Big_Tone wrote: ↑Sat Mar 19, 2022 3:57 pmI followed up with PPE again and was told they’re working on headers that will fir the M56x. Sounds like they will have them this year. The PPE header doesn’t include cats, so you’ll either connect to the secondary cats (if you still have them) or get aftermarket ones. I removed my secondary cats, so option 2 is what I’d have to do. This also appears to be what’s in the video review. I noticed that the CEL was on. Is that due to the cats or something else? I need to pass emissions, so if this mod is going to throw the P0420 or P0430 then I can’t do it. Anyone know if this would be the case?
According to the parts websites I've looked at, you are correct in that the RWD and AWD share the same manifold part number. They also share the same Y-pipe part number. However, they do have different motor mount and motor mount bracket (left and right) part numbers. They also have different transmission mounting hardware. All of this this could affect the fit of the headers relative to the chassis, steering and other AWD components even though the manifold part numbers are the same.Shanehsmp wrote: ↑Thu Sep 02, 2021 5:51 pmHmmmm, based on this pic, it looks like these would fit the X, I was switching out my widebands and there was a lot of room between the manifold/converter and the prop shaft/front diff. The fact that the X and RWD use the same manifold makes me think this is a fit. By chance, do you have any other pics looking underneath into the engine/cradle?
Yes you have to pass an emissions test every year before you can renew your plates. Test results are uploaded to the DMV database so you won't be able to complete the transaction otherwise. As far as cost, in addition to the headers, you'll need a set of cats and probably a set of O2 wiring harness extensions since the existing ones will probably be too short because the headers will put the cats further downstream. You'll need to figure the cost of removing the manifolds and installation of the new parts and tying everything into your existing mufflers. Then add tuning which is around $550 or so plus a $200 core patch if your ECM is not supported. You might be able to delete the cats if the O2 sensors can be tuned out. That part I'm not sure about on the VK platform. When I had headers installed on my CTS-V I had the option of cat delete tuning but I chose to go with a 3" hi flow catted X-pipe instead.Big_Tone wrote: ↑Sun Mar 20, 2022 1:15 pmOk thanks! My plates renew in July and I’m not sure if I’m going to have to test again (just did last year). I’m trying to keep track of everything I’ll need if I do this. My CEL just came on a couple weeks ago. I had just bought some gas that I think was cheap, so I bought a cleaner and cleared the code. So far, so good, but at 122k miles I know it’s inevitable that the cats have to get replaced. Trying to gauge the cost between this option and OEM.
Yep. According to PPE the headers are $2,100. Adding the cost of high flow cats at approx $250, a tune with patch (if necessary) and I'm at $3,100 for parts. That's approximately the cost of parts and labor to replace the existing manifold. Depending on if I can find a reliable shop with a decent labor rate I just might do this.armybrat wrote: ↑Fri Mar 25, 2022 10:07 amYes you have to pass an emissions test every year before you can renew your plates. Test results are uploaded to the DMV database so you won't be able to complete the transaction otherwise. As far as cost, in addition to the headers, you'll need a set of cats and probably a set of O2 wiring harness extensions since the existing ones will probably be too short because the headers will put the cats further downstream. You'll need to figure the cost of removing the manifolds and installation of the new parts and tying everything into your existing mufflers. Then add tuning which is around $550 or so plus a $200 core patch if your ECM is not supported. You might be able to delete the cats if the O2 sensors can be tuned out. That part I'm not sure about on the VK platform. When I had headers installed on my CTS-V I had the option of cat delete tuning but I chose to go with a 3" hi flow catted X-pipe instead.Big_Tone wrote: ↑Sun Mar 20, 2022 1:15 pmOk thanks! My plates renew in July and I’m not sure if I’m going to have to test again (just did last year). I’m trying to keep track of everything I’ll need if I do this. My CEL just came on a couple weeks ago. I had just bought some gas that I think was cheap, so I bought a cleaner and cleared the code. So far, so good, but at 122k miles I know it’s inevitable that the cats have to get replaced. Trying to gauge the cost between this option and OEM.
I gutted my primary cats because they were near dust....I also replaced my Y pipe and added in hi flow cats from a mustang (2 way cats, we need 3 way to get rid of all the odor)....anyhow, I added these, o2 defoulers and I have not received a 420/430 code once. Mind you, I still need a tune as the car cannot compensate enough for the larger freer flowing exhaust and tends to over-fuel at idle due to a lean condition.Big_Tone wrote: ↑Fri Mar 25, 2022 10:38 amYep. According to PPE the headers are $2,100. Adding the cost of high flow cats at approx $250, a tune with patch (if necessary) and I'm at $3,100 for parts. That's approximately the cost of parts and labor to replace the existing manifold. Depending on if I can find a reliable shop with a decent labor rate I just might do this.armybrat wrote: ↑Fri Mar 25, 2022 10:07 am
Yes you have to pass an emissions test every year before you can renew your plates. Test results are uploaded to the DMV database so you won't be able to complete the transaction otherwise. As far as cost, in addition to the headers, you'll need a set of cats and probably a set of O2 wiring harness extensions since the existing ones will probably be too short because the headers will put the cats further downstream. You'll need to figure the cost of removing the manifolds and installation of the new parts and tying everything into your existing mufflers. Then add tuning which is around $550 or so plus a $200 core patch if your ECM is not supported. You might be able to delete the cats if the O2 sensors can be tuned out. That part I'm not sure about on the VK platform. When I had headers installed on my CTS-V I had the option of cat delete tuning but I chose to go with a 3" hi flow catted X-pipe instead.
Based on what they sent me a couple weeks ago, they said they'd have it done soon. There wasn't a specific date.Shanehsmp wrote: ↑Fri Mar 25, 2022 6:13 pmI gutted my primary cats because they were near dust....I also replaced my Y pipe and added in hi flow cats from a mustang (2 way cats, we need 3 way to get rid of all the odor)....anyhow, I added these, o2 defoulers and I have not received a 420/430 code once. Mind you, I still need a tune as the car cannot compensate enough for the larger freer flowing exhaust and tends to over-fuel at idle due to a lean condition.Big_Tone wrote: ↑Fri Mar 25, 2022 10:38 am
Yep. According to PPE the headers are $2,100. Adding the cost of high flow cats at approx $250, a tune with patch (if necessary) and I'm at $3,100 for parts. That's approximately the cost of parts and labor to replace the existing manifold. Depending on if I can find a reliable shop with a decent labor rate I just might do this.
https://www.mandrelbending.ca/collectio ... l-catalyst
I was also hoping PPE would have confirmed the AWD option, they told me they'd have it confirmed as of last week. ...so I guess it didn't work?
I don't think the tundra engine is tuned to 400+ HP, and 400+ TQ from factory, could be where some of that additional HP and TQ are coming from.trayday wrote: ↑Sun Aug 29, 2021 7:16 amI'll build a 2.75" so we can see if there's benefits, since it doesn't seem it's been done on our 5.6 staying NA. If it's boggy down low, ill make adjustments. It's just hard for me to get past the stock 5.7 Tundra motor gaining 48whp/89wtq with LTs/3" exhaust.armybrat wrote: ↑Mon Aug 23, 2021 7:58 pm
Since Ken mentioned the Scat Pack in his video...just for comparison, that car uses a 2-3/4" dual exhaust stock from the factory that is sized and tuned for 485 hp performance with room to grow. The M56, well we know that exhaust is sized for 420 hp luxury not performance. Just installing the headers and 2-1/2" X-pipe opened up the flow quite a bit and made room to grow. That with the HPS hoses and tune you're at Scat Pack stock performance. Ken's M56 is probably at the maximum hp for a stock engine so the 2-1/2" exhaust sizing is good enough IMHO. If you go further and build the engine then a larger exhaust diameter should be considered.
There's a guy running 700 hp on his stock motor turbo car, so I'm not worried about the motor not being able to handle it.
For now, determine what DTC you're getting. If it's a P0420 (driver's side) and/or P0430 (passenger side) DTC, get some O2 sensor extenders from Amazon or Ebay and install them in the affected O2 sensor port. Reset the code(s) with a scanner tool or go to an auto parts store and they can do it for you. If you car is like mine it will pass emissions no problem. Then you can take your time to explore the header option. There are several inexpensive handheld scanner tools available - I would invest in one just to have around the house to be able to troubleshoot your other cars too.