It would be interesting to see Andy’s opinion of these.
the price is good.
my only concern would be that the individual pipes are not even lengths - I don’t know how much that matters...

 

 

Did anyone try these out? or have any thoughts about them?

 

To bump an old thread:

I’ve been trading emails with Simply Performance for the past few days regarding their Tubular Manifold for the AJ16. (And a few other bits)
I’ll update with whatever I learn from them.

 

What I’ve learned from Simply Performance:

The tubular manifold is £695 plus shipping.
Heat wrapping or shielding is recommended, and it’s designed as a direct replacement for the 2 factory exhaust manifolds + the factory downpipe.
It deletes the downpipe catalytics, and only has sensor bosses for the downstream / lambda oxygen sensors.

The 2 upstream sensors (if your car has them) would need removal.

Does anyone have any experience with disconnecting / deleting the upstream sensors on an AJ16? Any ideas of the effects?

 

Thank you for sharing that. How does their tubular manifold compare with the one from Hayward and Scott? There was another member on the forum who said he would produce something akin to the Hayward and Scott version but alas, no news from him for over a year now...

As for the O2 sensors, I believe the downstream ones are the ones relevant for keeping the engine within the proper air to fuel ratio and you'd have a check engine light on with the other pair. You can always replace your ECU with one from Europe, since those didn't have the other pair (among other pollution control devices). Other than that, I have no other ideas...unless you want to weld two more bosses for the other pair of O2 sensors

 

You’re welcome! As far as side-to-side comparisons, I’m not sure how it would line up with the H&S version.
The description from their website follows: NOTE-it’s listed as an XJ6 part, not XJS

AJ16 replacement Manifold. Removes the pre-cats and connects to the main cat section underneath the car. This will fit both Supercharged and non-Supercharged models. There are provisions for the two lamda sensors to go back in and as they are downstream of the cats this will not bring any lights on. This item is made to order. Delivery approx 4+ weeks

Price is £1,080 non-VAT.

Everything I’ve read has agreed with your thoughts on the sensors. Simply Performance suggested unplugging the 2 upstream sensors and driving a short distance to see what occurs, I may try that tomorrow. The description above indicates that their removal won’t trigger any warnings, but what I’ve cumulatively gathered is that it may shift the ECU into a closed loop mode.

I’m also going to inquire about possibly having two bosses built into their product, simply because I’m unsure of the long term effects of unplugging O2 sensors…

I like your idea about swapping the ECU, though!

 

buying a european ecu is shooting yourself in the foot. it needs an immobilizer input, i just sold somebody an american ecu so they could get their car started

get andy or somebody else to write you a custom
map with egr and cat check deleted

 

So today I unplugged the 2 upstream sensors and drove around the block, maybe 5 minutes.
The CHECK ENG light was on before I got into second gear.
Two codes:
P1185 - O2 Sensor Heater Circuit Open-Hardware Fault
P1186 - O2 Sensor Heater Circuit Shorted-Hardware Fault

So it seems like H&S was wrong, or maybe it wouldn’t fault code an XJ6. No idea.
I‘ll follow up with Simply Performance and see what they can do, and start looking into xalty’s suggestions.

 

Sure, they are. American cars have ECU that needs 4 o2 sensors so if you were deleting upstream sensors you'd need an european ECU with the keys for immo as xalty explained. Alternatively you could cut out your cats and integrate/weld them into your new exhaust along some inserts for upstream sensors or talk to our chief engineer Andy here on how to get them deleted from your current ECU map. Dont think it would take more than a couple of hours to do. Also shipping from UK would probably cost half the price of manifolds.

 

https://www.jaguarforums.com/forum/x...-dream-238780/

Here is another option but I never heard any updates so not sure if this is still happening...you could try reaching out to him and see if this is something that suits you