I'm considering getting some sports Cats put in after my recent aftermarket custom exhaust change over.

I was wondering what difference in sound and performance this will make to the car (only other mod is a panel filter).

Below is a video of the current sound which I like very much I wouldn’t mind just a little bit more though, however I don’t want any unwelcome noises at 70mph from inside the car.

 

Hi L80OUS,
I am sure some of the guys would like to help, I'd be intersted in following your thread and seeing what works out, I think it'd be a big deal as I am not that mechanically clued up.
I've seen some beauties and heard some of the aftermarket add-ons and mods and they're really good!
I really think a lot of parts would need looking at/replacing to make it worth your while and maybe remapping of some sort too as I believe the modern ECU restricts the overall performance bigtime!
I heard a recent Jaguar X Type on you tube with an Italian set of pipes and it was awesome, BORLA, but I expect there were a few more modifications than just that
exhaust, I hope you fave fun and it floats your boat! Stu

 

I believe the Borla (exhaust systems) is an American company, headquartered in California. They don't list anything for our cars...

 

Jaguar XJR Performance Exhaust Borla

 

An exhaust is something on my to do list but not anytime soon due to budget issues.

I quite like the sound of the Borla exhaust here which seems to be fitted without cats and doesn't seem to be too loud even when being revved.


I'm a massive fan of the sound from this setup, it sounds a tad AMG esque and I'm guessing the centre silence being removed plays a huge part in it but it might be bit too loud for everyday use.

 

I stand corrected....I didn't find a thing when I searched!

 

To give you guys more feedback, since I had the exhaust on the car for a while now.

I absolutely love it. I think as the packing seasoned (you don't see bits of stainless steel flying out anymore) the sound got even better

I keep on getting complements from random people when I pull into parking lots.

 

Ok so far the noise results seem good.
But what sort of performance gain can be expected through full stainless sport-cat system? 20BPH or maybe 40BHP?

 

Cats are the biggest restrictor. I went with a Borla as I fabricated custom 2.5" downpipes in place of Cats and running it into the stock 2" system was a sin, plus it was rusted to **** and I got the Borla for a steal.

The 2.25" Borla sounds awesome, looks great, and will probably outlive the car.

 

@Adam699

How'd you get the O2 sensors to play nice with the catless downpipes? Did you just run those standoff bungs that mount the sensors a little further out of the exhaust stream? I've been wanting to do this for a while, but it sounds like most people who attempt it have problems with the O2 readings.

 

I've heard that the credible power gains are 10-15 bhp, not anywhere near the 40 bhp range unless you replace the cats with 100 cell high flows, and then only if they are clogged before hand.

 

Bump to this thread. Going to get 200 cell cats I'm thinking, worth £500/$800 for the pair or not, don't want to waste my money but if these cats with the exhaust system will put me near 400bhp I'm gonna do it, can anyone confirm? Anyone done it and dynod?

 

If your stock cats are in good shape (not clogged), then the high flow nameless cats will give approx 12 hp from the cats alone, but a much healthier sound. Anyone advertising more than this is flat out lying. Obviously if you add larger and less restrictive exhaust system also, the gains will be larger.

I would definitely recommend getting your TB bored by maxbore.com for $150+ shipping. you can also add another opening to your air box which will give enough power to notice. A +1.5-1.7 lb upper pulley ought to then complete the package for a very reliable 420 HP or so.

They will likely run about 35 hydrocarbons on the rolling dyno smog test if that matters to you.

I just put a ceramic coated set up for sale at $800 obo ( I paid 1,170 with coatings)

 

Thanks for the helpful info, while the car was in the air today I had a look underneath. The current cats are in bad shape, 15 years old and done 155k miles, one has a hole and both are more than likely clogged up beyond belief, the car struggles to pass UK standard MOT emission test, unless the cats are red hot and revved to perfection.


I will take on board what you said about the TB sounds like a nice gain and will do this in the future.


However due to my current cats being so poor I'm thinking this could be quite a good upgrade, like you said I'll gain 12bhp for 200 cells cats, but maybe I'm already loosing some BHP due to them being clogged with a hole? Would I be right in thinking Ill get the lost bhp back plus the 12hp?


The aftermarket exhaust I have already on, is less restrictive and smaller less baffled silencers. In your experience what would the gains be including the cats??

 

If your current cats are toast, you will see the 12+ whatever your losses are, I could speculate your total gains from the cats alone could be 30 hp. So say +12 over perfectly running stock cats, and "possibly" +18 more that your cats "may" be costing you already due to being clogged.

 

Nice, Now should I get 100 or 200 cells cats. If I'm correct the 200's will pass emission test where the 100's wont? However getting either through and MOT isn't a problem, however I don't want any engine management lights coming up on my dashboard, would this be the case with the 100's?


Is there much more to be gained with the 100's over the 200's?

 

I made my own single cell cats

 

the 100's will not give you any more power than the 200's

 

VERY nice work!

 

Ok booked into the garage and CATs are being fitted this saturday.

Now onto the next step.....

I just called a popular Jaguar tuner in the UK and I asked him about what he'd recommend me do next.

He recommended lower pulley over everything else, everything else being next to not worth it.

Supercharger porting: Not worth it with gains of only 8BHP

ECU remap: Not worth it no gains.

Sports exhaust and sports Cats: Not worth it 8bhp in total from them both??!!

Upper Pulley: Might as well do the lower pulley which would mean power gains of 50BHP @ lower RPM's and 15BHP increase at higher RPM's.


Now looking at what he just said it doesnt quite sit right with me, perhaps he gets a massive profit for fitting lower pulleys. 8BHP for full exhaust system - not from what I've read, 8BHP for Supercharger porting? Again not that Ive read.

Can any-one shed any light on this?