Hey freaks! I do hope everyone is enjoying their Friday!


I am embarking on my first modification this week, I need noise.

I don't know where I am at with the car, I just fixed her up and she is running perfect.. Then I find Avos Twin Skrew Kit thread, scared to message him, it may cause a divorce.. Anywho, now I have the burning desire to do crazy things like an LSD, and the aforementioned TS (maybe), Low temp Thermostat.... What ever..

But starting with exhaust.

Looking to move to 100 or 200 cspi cats and probably a resonator delete.

1. Can I do this without emission issues?

I just popped in the local muffler shop and asked for their opinion, they told me not to mess with the cats or I will be dealing with never ending MIL code issues. Which doesn't really make a lot of sense to me.

2. Aside from Mina, what equipment are you guys running to get a meaner sound out of the 4.2 SC??

Please point me in the right direction.

3. If I delete my two middle resonators then what should I put in it's place, should I just place in an H pipe?

I am worried that will give me too much drone at highway speeds. I want it too sound like it actually has a V8, but do not want something obnoxious or RICEY.


I like a snarling crackling exhaust, but again not obnoxious. What do you guys got for me? Caaammbo, you big sweetie please help me out.

Also, Headers.. Link me up.


MY 2004 XJR, 90,874 Miles.

 

My car is an 05 XJR

Caldoofy intake with Mina Gallery air filter, 3lb powerhouse pulley, upgraded Aux. pump.

My 1st exhaust mod was to remove the center resonators and replace them with an X-Pipe. Car was still quite at idle but produced a nice growl at WOT. For me there was no noticable drone while cruising. This mod was cheap and can be easliy returned to stock if needed. Didnt have any MIL issues.

Good Luck, Woodford Jag.

 

I have a non S/C XJ8 went to 2 and 1/4 inch pipes out of the standard headers into 200cell High flow metal substrate cats into a merge pipe under the floor then a custom resonator car sounds awesome left the back half stock I also fitted new 02 sensors at the same time

Only problem when I did this I ended up getting a light on the dash cant exactly remember the code of my head look back in some of my previous posts it will be there I ended up having to have the car remapped a very costly exercise

There are things like mini cats available these will get rid of the dash lights but to me that's not the right way to do things after the remap the thing fly's and I am still getting 700 k,s to a tank on the open road so very happy just not with all the cost's

 

The only time I would expect a MIL is if I messed with the cats. Could you please elaborate on the upgraded Aux pump, mine is currently unplugged and I have been trying to chase down the bosche part number to replace it, found the oem one for 150$ so its not that big of a deal, but if there is an upgrade available I would rather jump on that.

A few more questions;

Is the XJR equipped with 2.5in piping?


I think what I am going to do is go strait pipe in the middle, deleting the two center resonators, then go with flowmaster 50 series to replace the stock mufflers.

Are there two smaller resonators before those two mufflers? I do not see them on the JEPC???



Shall I delete these as well?

I am assuming I need offset inlet and outlet model 50s, agian 2.5in or 2.25in?



What did that run, and did you have an Indy do it?

Cheers guys.

 

These are cool, but expensive much.





This ---


Thanks again fellas!! Again open to any and all suggestions. So many views, not many replies.. Seems to be a common theme with the jag forums :-P





40 minute UPDATE:



This man had good tastes.... I'll emulate this for sure.

Magnaflow Muffler 6" Round 14" Body 2.5" C/C 14616

And X pipe SS 2.5"


So now I just need to know what size the pipe is and the offset.

MoscowLeaper- "Muffler inlet is 2.25", outlet is 2.25" too, but with an extension for a stock tip."

Does anyone know the stock dimensions for the XJR mufflers? Don't want to buy something too wide.

 

The original cats on a non S/C car are 400cell the ones on a S/C car are 600cell

you can hold the 200's up to the light and see light at the other end
You cant do that with 400's or 600's doesn't matter how big the pipe is after the cats the cats are a major restriction not to mention how old are they and how many miles on them they are not a lifetime part also the technology has changed with them that's why I went to a metal substrate cats from venom Products | Venom Exhaust Works | Performance Exhaust, High Flow Catalytic Converters

I experimented with a full headers to tailpipe on my XJR6 in fact I am the only guy in the world that sells headers for the AJ16 engine and when I was planning the mods for the V8 after all the experience with the XJR6 I realised the cost per HP increase didn't warrant the manufacture of headers

The reason I make headers for the AJ16 engine is the standard cast rubbish cracks and they crack pretty regularly the headers on the V8 cars don't crack!

Look at the photos of my old XJR6 that's a $8,000au exercise to make maybe 20HP just for the exhaust
Then a larger S/C cooler pump from Johnson pumps Circulation Pumps - CM10, CM30 & CM90, 12V or 24V | Johnson Pump - Marine | Product Detail
full cold air induction porting of the M90 S/C and then sending the ECU to England to have it mapped By Andy Stodart the only guy in the world that can do this ECU
He is on the X300 side of this forum check his credentials

Power is made in the front half of an exhaust system the back half is to shut it up that's the facts

Look at race cars and drag cars they have very short pipes out of the heads or just exiting under the front side of the car

Obviously we cant do that with our cars as they are daily drivers and let me tell you to big is notnecessarily a good thing big pipes create drone

As I learned with the XJR6 it had twin 2 and 1/2 inch system should have gone for 2 and 1/4 and I wouldn't have had to stick so many mufflers and resonators in it to stop drone again that was a learning curve as I was the only guy at that time to have a full system

I have since sold a few pairs of headers to guys who are doing up a couple serious XJR6 cars

If you just want to create a note pull the centre resonators out do a crossover pipe or merge pipe racing tells us this makes more torque at lower revs something all cars can do with a bit extra then maybe a couple hot dog style resonators that should give it a bit of a note if you totally remove the centre resonators it will cackle on deceleration not cool on a Jag
Just my 10 cents worth

Oh and the remap was horrifically expensive But I own the map so anyone that copies my system I should be able to give them a copy

I am getting a mate in Melbourne to take a copy of my tune so we can look at what the guy that tuned it did and pass it on to other member's at a later date again its only for N/A cars sorry all you S/C guys

 

Naso--Lituratus

The upgraded aux pump is listed in other threads, It is the coolant pump below the expansion tank. 001 bosch pump Mercedes used.

As for the exhaust mod that I did myself, I removed both center resonators (part #1 in the diagram) I then cut the pipes off each end of the assembly, used 2.25" straight pipe and a X-pipe to replace the muffers and reinstalled the new assembly.

I still have the stock tail pipes and mufflers.

Woodford Jag

 

If you mean the rear mufflers/resonators, they are massive, you will struggle to get something too big...

I have smaller ones on mine and the empty space around them is quite an eye-opener...

Only thing is if you do go for wide ones, then the inlet/outlet need to be off to one side, not in the middle...

 

Thanks for the thorough write up there Doc! Very Insightful!

Woodford, I am going to do what you and Riski did and go with the 2x resonator delete, put in place an X pipe, and then go a step further like Riski and replace the stock rear mufflers.
Putting off the cat change for now, untill I figure out how much a remap will cost, also need to figure out what direction I am taking this before then.

Cambo, Yes I was referring to the rear mufflers. Just pulled a tape on them, looking at ROUGHLY 7"x11"x17"

I was under the impression that they were offset/offset. But from the Diagram, and these photos, it look like they are both offset on the same side, with the outlet being slightly more center.


IN


OUT


You are saying go with center/offset Cambo???

May you receive a thousand blessings kind sirs.

 

Rear mufflers are best centre mount no need to go oval the mufflers on the cars are huge to say the least and heavy

Just makes sure the guys fitting them centre them nothing worse than tailpipes at different angles

I attached pic's of my old XJR6 aftermarket rear mufflers they where huge and they still fitted easier than the original oval ones LOL


probably make more power by losing the weight LOL

 

Well Doc, I have decided to go with Borla XS Pro Mufflers, I hear they sound great but do not resonate too much.

Borla makes a straight tube muffler, the XR1 but people say they are very loud.

The offset/center should work just fine, it is a smaller muffler so when the new pipes are installed it should line up just perfectly.

Muffler shop told me to go with 2.5in mufflers.

Borla suggested I add one of their dual outlet performance resonators in place of the stock two center ones in stead of an X. Debating on that.

 

Naso. The absolute BEST mod I believe you can do right out the bat is a Caldoofy Intake tube (do a search) attached to a MINA gallery air filter kit. You will love the scream of the engine when you floor it...And more boost/easy install. I felt the difference.


As far as exhaust you are spinning around in circles. The Borla xs is a very good muffler but sounds nothing like a flowmaster(which don't flow very well might I add). Why not add the borlas and remove jut one resonator and see how you like it. If its to quiet remove another.....If its too loud go and get your borla dual in and out resonator installed. Catss may be restrictive or not..But at that cost I cant imagine its worth the admission. Plus the cat swill make a huge sound difference as well.


Look into the intake first..Seriously

 

Slowpoke, I absolutely did spin in a circle for a while there.

The reason I was considering Flowmasters is because I used to have a pair of the what I think were 50s on my old Mustang, and I honestly thought they were just fine. Mind you nothing special but just fine.

But after doing a little bit of reading I found Riskis video and considered the Magnas.

I kinda want something unique, definitely custom..

I found this thread when researching the Borlas, which everyone seems to be pretty happy with quality and sound wise.

https://www.jaguarforums.com/forum/x...eo-clip-88813/

Love it. 1,000,000 mile guarantee of Borlas stuff too.

So borla it is, I bought:

XS Pro Mufflers (40358) center/offset 2.5in
XS Pro Dual Outlet Resonator (400286) 2.5in
Chrome Tips Roled Angle Cut Embossed (20156)

$450

Going to replace everything behind the cats with 2.5 inch pipe. Not going to touch the cats as of now.

Should be a pretty sweet setup when all said and done. I had definitely already planned on doing the caldoofy mod with the mina setup. Do you guys still take off the intake flap with the mina box installed?

I have been waiting for the rain to stop so I can go and remove mine lol.

Thanks slowpoke!

 

Naso-Lituratus

The WOT thottle flap will come out with your stock air box is you got the Mina Gallery cone filter. You should remove the solenoid and reconnect it. I dont think it will trigger the check engine light but it will give a code. I just zip-tied mine to the radiator support.

Its a good call to add the dual outlet resonator in case you peform a cat mod. I replaced both my cats with straight pipes I made when I had just the X-pipe and stock rear mufflers. Man was it LOUD with a lot of noise echoing in the x-pipe. The cats do a lot too supress exhaust noise.

Not wanting to give up on the straight pipe mod, I replaced the X-pipe with a Magna-flow dual inlet/outlet X-muffler and ended up with a quiet car at idle. raspy when I crack the trottle and nice sound at WOT. May be too loud for some but I like it and can easily reinstall the cats if needed or install some performance cats.

I am using Mini-cats to trick the rear O2s and I dont have any MIL

I have thought about replacing the rear mufflers with some magna flows but would rather save money for other mods like an LSD. S-type strut conversion and this is not a mod but will need a headliner eventually.

Woodford Jag

 

Thats exactly why I added the dual in the middle, for that future cat upgrade.

I actually just bought the K&N filter. Seems like the mina will let a lot of hot air in.

Waiting on caldoofy to respond to pm.

Yea my headliner will need replacing in the next few months too. Sucks.

 

https://www.jaguarforums.com/forum/x...w-dyno-118477/
You can see my mina/caldoofy intake install here. I also removed the solenoid from the air box and left it plugged in. I hid it and zip tied it. No codes ever and runs excellent. I also reconnected the cold air scoop using a few bits I had.


I think that exhaust setup should sound nice. I still haven't done mine yet. Good luck!

 

Just an update, still waiting on my parts.

I have had a few estimates done on the job in question. Most are a little taken back by the install it seems... I have been quoted 1500 and 2000 for install, all stainless. Right around 400 for regular aluminiumized pipe.

Not sure what I am going to do on that end. Decision is still up in the air at this point, but honestly I was not trying to spend that much on exhaust.

 

Any updates?

 

https://www.jaguarforums.com/forum/x...-137235/page2/

 

hi there,

Is a sports exhaust fitable for the X350 also fitable for the X358?

Best wishes
Nic