Hi all , I currently have the standard quad pipe exhaust system on my 2010 5ltr supercharged XKr is there a better sounding exhaust system available that doesn’t involve swapping the entire system that gives a louder throaty sound? Thanks bob

 

Don't know if this is possible on quad exhaust XKR's, but I found that the best way to release the V8 throb on my V8 XJ Sovereign, XJR and Super V8 cars was to remove the front (common) muffler to separate the V8 exhaust beats. The rear mufflers can then be removed to increase volume if required. I found that increasing pipe diameter had little effect on sound.
This inexpensive mod produces a satisfying muscle car throb on acceleration, without excessive drone on cruise.

 

henry crun - are you a talking about the muffler I have circled in red? Sorry for the 2 stitched photos. This is the under belly of my 2010 XKR I took today.

 

Yes - that's it.
This front box is not really a muffler. It is more of a resonator with 2 straight through perforated pipes inside a common cover filled with sound absorbing material. It has zero effect on performance, but acts as a crossover (e.g. H pipe) to blend the two exhaust pulses for acoustic 'smoothness'. This blending produces the traditional Jag 'growl' to emulate the original British 6 cylinder Jag sound.

If you prefer the V8 throb, replace this box with 2 straight pipes. For increased volume, remove (or replace with straight pipe) 2 of the rear boxes (which are true mufflers) unless your car has bi-modal exhaust valve system).

Despite what some other posts claim, the AJ V8's have the typical 90 degree cross-plane crankshaft and firing order so they sound the same as any other cross-plane V8 with an unrestricted exhaust. This cross-plane crank and firing order configuration produces the distinctive 'throb' because of the exhaust valve opening 'overlap' of the rear 2 cylinders of each bank. I.e. exhaust valves of the 2 rear cylinders are open simultaneously for a brief period, which produces a relatively larger exhaust pulse into the exhaust manifold, which alternates from bank to bank. The front exhaust resonator is designed to blend these pulses and smooth the throb.

 

Fixed it.

 

Welcome to the forums Robert,

I've moved your question from General Tech Help to X150 forum. This is the place to post technical questions about your model.

Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some information about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.

Graham

 

If you "want the best", Larini considered top shelf for any marque they make an exhaust for. There are a few British manufacturers that you should consider too.

 

It all comes down to what is your budget and what kind of sound are you looking for. There are different sound clips on this form as well as on youtube. Start by looking at these to see what fits your needs. Also instead of hacking up your existing exhaust just go to a good muffler shop and have new pipes made up. I would suggest the 1st phase would be to remove both of the center silencers. You can replace with 2 straight pipes and then pull fuse 19 for the valves in the back box. If still not happy you can have an X pipe installed and the next step would be an aftermarket cat back system.

 

LOTS of XKR guys do what Henry Crun suggested; remove the resonator section and have two straight pipes with an "X" crossover installed. If it's done competently, you still have the entire center section you can replace if you ever want to go back. Total cost to have a muffler shop do this is like $200-250, compared to the multiple-thousands that a new system would cost.

Plus..... you DID remove fuse 19 from between the rear seats, RIGHT??????

 

Nice touch to my pictures Reverend Sam! Looks a lot better!!

 

Thanks for the great information I’ll look into this and yes I removed a fuse although I cannot remember the number

 

How do you find that fuse?

 

Fuse panel behind the rear seats, between them. Pull up, then out, then up again on the center back section and it'll come off eventually. The fuses are numbered so it's easy to find. That fuse controls the vacuum which holds the secondary pipes closed, so therefore OPEN all the time.

 

Hi i think that i'm going make this on my xkr 2007 :

 

Face the music: catalytic converters do become less efficient over time.

Want an improved sound too: Just replace your cats with 200 cell cats. remove fuse 19 and live with it for a week. Then tell me what you think.
Consider the x-pipe AFTER this suggested change.

FWIW

 

Thanks, I'll try that. So the #19 fuse is it behind the rear seat so you have to take the seat out?

 

Post 13?


Sheesh, sometimes I wonder why I post useful information

 

I'm sorry but it wasn't clear if the fuse was behind the rear seat or if it was in the trunk behind the rear seat. Why would Jaguar place a fuse box behind the rear seat where it's hard to get to?

 

You say you have a 2006 XK8.

A 2006 XK8 is the model X100, looks like this;


You are posting questions in the X150 forum, an X150 looks like this;


They are totally different cars. There is almost no shared parts or technology between these two models.

The exhaust layout is totally different.

There is no "fuse 19" in an X100, because they did not have an active exhaust.

Please go to the X100 subforum ==>> https://www.jaguarforums.com/forum/xk8-xkr-x100-17/

You will find very little information here in the X150 subforum which is applicable to your X100.

 

Post delete....wrong MY.