I was cleaning up in the garage and was looking at my window sticker for my 2012 XKR. One option was the Performance Exhaust (X pipe) which was listed at $1400. It made me wonder why the cost vs the standard exhaust which seems to have 2 additional silencers in the system . Also are the mufflers the same for the XKR . Just asking

 

As I understand the only difference is the resonators on the standard system are replaced with the X-pipe.

 

That's my understanding also but it sounds like an expensive X pipe.

 

Yes. I think it cost me about $300 to have it done after market, but my services guys mentioned that the exhaust tips are different as well, so the sound isnt identical.

 

I don't think that's actually the case. Cars with just an X-Pipe don't sound exactly the same as an XKR-S.

The performance active/XKR-S back box also has a different part number to the standard item.

 

Cost me about $150 to have a similar piece put on the car.

 

Pardon my ignorance here but what is the "black box" that you are talking about. Is this the rear muffler or the electronics that activate the 2 by pass tips.

 

Engine ECU. As in engine control unit.

 

OK thanks , didn't recognize it as I usually go with ECU . I assume that the ECU for the XK is different from the ECU of the XKR but is the XKR the same as the XKR-S. Considering they are both S/C and maybe the difference would be the fuel mapping why would there be a need for a new ECU. Isn't this done in SW and wouldn't you be able to update a XKR with the SW mods from an S. Somehow I thought that the S was a retuned change to both engine management and suspension management. The luxury of changes in modern cars is in the SW. I see some of the CHIP ads being able to increase HP by influencing fuel and timing so it seems that a 40 HP gain (8%) wouldn't be to much of a problem. Just thinking out loud

 

Not ECU; BACK box as in rear muffler, back box may just be a British term.

 

OK , translation problem here , thanks. I used to have interpretation issues during my business trips to England. it took me some time before I knew what a brolly was.

 

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Jagtoes,

This question about the differences between "Performance" and "stock" Active Exhaust is asked frequently, yet I have never seen an answer with anything definitive. When I do a parts search on the Intermediate Exhaust (referred to as the X-pipe by many) for my 2012 XKR I get #13. And when I search Muffler I get #15:
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[ 13 ] EXHAUST SYSTEM / EXHAUST SYSTEM / EXHAUST COMPONENTS / Intermed pipe Part Number: C2P24864
intermed pipe 5.0 LITER, W/SUPERCHARGER, w/o XKR-S
MSRP $660.40 Online Price $549.88

[ 15 ] EXHAUST SYSTEM / EXHAUST SYSTEM / EXHAUST COMPONENTS / Muffler & pipe Part Number: C2P24867
muffler & pipe 5.0 LITER, W/SUPERCHARGER, w/o XKR-S
MSRP $2,210.00 Online Price $1,838.72


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And when I do the same search for a 2012 XKR-S I get:
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[ 13 ] EXHAUST SYSTEM / EXHAUST SYSTEM / EXHAUST COMPONENTS / Intermed pipe Part Number: C2P22073
intermed pipe 5.0 LITER, W/SUPERCHARGER, w/XKR-S
MSRP $1,210 Online Price $1,006.72

[ 15 ] EXHAUST SYSTEM / EXHAUST SYSTEM / EXHAUST COMPONENTS / Muffler & pipe Part Number: C2P24865
muffler & pipe 5.0 LITER, W/SUPERCHARGER, w/XKR-S
MSRP $4,680 Online Price $4,680.00 $3,893.76

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As you can see there ARE indeed different part numbers (and prices) for these exhaust systems. What is NOT clear is the difference between the $1400 upgraded Performance Active Exhaust and the stock Active Exhaust on an XKR.

Does anyone know for certain what Jagtoes got for his $1400 besides the reduction of the 2 silencers and the addition of an X-pipe?
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When I look at the picture above for the standard exhaust it makes me thing that this is for the XK and not the XKR because it only shows 2 exhaust tips. If that is the case then I would see the mufflers being different. I would assume the X pipe section is the same for the XKR with performance exhaust as the XKR-S. If that is the case would the muffler be the same or is it different for the XKR with standard exhaust. Got me confused now.

 

The diagram they use for the XK, XKR and XKR-S seem identical. The ONLY differences I caught were the the XK has just 1 silencer in the intermediate pipe and no air pump/vacuum hose. The XKR/XKR-S are identical, this is why I did not include all the diagrams. See for yourself, here are links to all 3:

XK diagram: https://www.jaguarmerriamparts.com/p...iagram=4740253

XKR diagram: https://www.jaguarmerriamparts.com/p...iagram=4740257

XKR-S diagram: https://www.jaguarmerriamparts.com/p...iagram=4740257

As you can see both XKR and XKR-S show 2 silencers and single exhaust tips but the part numbers do change.

So to sum it up, there ARE different part numbers for the XKR and XKR-S mufflers as well as the intermediate pipes. BUT no separate part number for the XKR "Performance Active Exhaust" option which I believe was your original question.

What most of us "know" is that the Performance option does remove the 2 silencers and add an X-pipe....still to be determined is whether it also adds the XKR-S muffler and/or other parts.

Hope this helps!?! I'd love to get this question answered definitively once and for all!

 

This is an interesting observation.


Wow. Huge difference in price. The diagrams seem to indicate the standard supercharger model XKR and the XKR-S have different rear mufflers. What exactly is the difference and which muffler is included with the performance exhaust option? It's obvious the intermediate X-pipe on the XKR-S is the same as the performance exhaust option on the XKR.


I would say the XKR-S and the XKR with the performance exhaust have the same muffler. If someone would go to the dealer with a VIN from an XKR with the performance exhaust option and a VIN from an XKR-S and ask for the rear muffler price and part number it should answer our question.

 

SNG Barratt list the part numbers for the standard and performance exhaust for the XKR and the part numbers for the muffler are the same as for the XKR-S.

The JEPC confirms that as well.

 

According to Dave Pook at Jaguar, when it was first introduced, the PAE/R-S rear muffler had slightly larger outboard pipes than the standard XKR to increase exhaust flow - they may have standardised on that later for all XKRs (perhaps as part of the MY12 update?). Unfortunately, they didn't make that mod for the XKR 75, so mine has the x-pipe but only has the standard R rear muffler.

 

So the XKR with the performance exhaust has the exact same exhaust system, X-pipe and rear active muffler, as the XKR-S; and, the standard XKR has both different intermediate pipe (no X-pipe) and a different rear active muffler. I always thought the XKR active rear muffler was the same on all XKRs and XKR-Ss. What is the difference?


Although I liked the exhaust on my 2011 XKR 175, I find the performance exhaust on my 2013 much better, especially in dynamic mode with the exhaust valves open.

 

Sorry, I should have looked at u102768's image - it's clear the PAE and R-S rear mufflers are always different to the XKR. DGL, as I said above, it's the outboard pipes that are different; the PAE/R-S ones are a little bigger.

 

That makes sense. I never thought there would be much of a difference. The difference in sound is gained from the X-pipe.