[xk8] XK8 Exhaust mods

Hi one and all…

I have a 97 XK8 convertible…awesome car, but the stock exhaust
sounds woeful…

At this stage I dont want to spend megabucks replacing a perfectly
good exhasut so I’d thought I simply remove some of it and replace
mufflers with straight through pipe…

I see there are three sets of mufflers… the big one near the
middle of the car, the smaller ones in front of the diff, then the
other pair at the rear of the car…

My thoughts are that removing the small pair in front of the diff
shouild give me a V8 sounding car without have the constabulary all
over me…

Anybody done this? With what sort of results? Any other advise
please?

Also, I see the pipes that go over the diff are appalling pieces of
engineering… Has anyone replaced those ‘squashed’ pipes with full
ones? Will they fit? I assume Jag did this for clearance
reasons… Cant imaging they left those in place on the XKR??

thanks in advance

Morro–
Morro
Melbourne, Victoria, Australia
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In reply to a message from Morro sent Sat 17 Oct 2009:

Hi
For what its worth
Clearance is not a problem as I found out having allways
asimed that even on my XJ-SC. wrong
According to Jaguar they are squashed to create back pressure
Last year I had Paramount Performance fit a Cat to Back
system by Miltek. 25 Year warranty Polished ST St & only a
few pounds more than the genuine Jaguar System

Open pipes from Cat to two rear boxes only (no squashed
pipes)gives extra BHP
I do no longer need to usr the Sport Mode button
110db not the loudest around but great
go to Paramount web site & find their sound bite.
also See my photo Album on this site–
The original message included these comments:

Hi one and all…
I have a 97 XK8 convertible…awesome car, but the stock exhaust
sounds woeful…
At this stage I dont want to spend megabucks replacing a perfectly
Anybody done this? With what sort of results? Any other advise
please?
Also, I see the pipes that go over the diff are appalling pieces of
engineering… Has anyone replaced those ‘squashed’ pipes with full
ones? Will they fit? I assume Jag did this for clearance
reasons… Cant imaging they left those in place on the XKR??


Bleasie International Cabriolet Register c/o 92hot@aol.com
GRIMSBY, United Kingdom
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In reply to a message from Morro sent Sat 17 Oct 2009:

Hi, thanks for the reply… I will try removing the mufflers
forward of the diff first and replace the pipes over the diff witrh
non squashed ones…

cheers–
Morro
Melbourne, Victoria, Australia
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In reply to a message from Morro sent Sun 18 Oct 2009:

I am far from an expert on these issues but have picked up
some info from reading hundreds of posts on other car forums
dealing with mods to the exhaust system. I believe I have
read that pressure/flow changes due to changes in the intake
and exhaust system can sometimes result in poor performance.
Specifically, I understand that low-end torque could suffer
from drastically decreasing the backflow pressure. Also, it
is my impression that the bang-for-the-buck is pretty poor
for exhaust mods (maybe 10-20 horsepower for $1,000 or
more–not exactly seat-of-the-pants noticeable).

Has anyone done any definitive testing of these cars with
respect to modifications in the exhaust system?

Doug
Los Angeles, CA–
The original message included these comments:

In reply to a message from Morro sent Sat 17 Oct 2009:
Hi, thanks for the reply… I will try removing the mufflers
forward of the diff first and replace the pipes over the diff witrh
non squashed ones…


SeismicGuy
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In reply to a message from Morro sent Sat 17 Oct 2009:

From what I have gathered the differences between
aftermarket exhausts and the OEM Jaguar exhausts are:

Removal or a reducing the size of the back boxes.

Cylindrical pipe instead of ‘crimped’ over the rear axles

Stainless steel construction and a choice of tips dependant
on preferance.

If you get a HALF system it will be from the resonator box
back, if it is FULL you will have a new resonator box or
piping dependant on how loud you want it.

The blueflame exhausts seem to be the most reasonably priced
FULL systems:

http://www.blueflameperformance.com/prange.php?modelid=225&makeid=35&pageid=3

They can be found new on eBay at a further reduced price.

Regards,

Adam.–
Adster
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In reply to a message from Morro sent Sat 17 Oct 2009:

As the owner of a 2001 XK8 Convertible I have also been interested
in purchasing a new exhaust system both for improved performance &
sound.Prices range from the JEC model (at about $400) to San Diegio
Macs effort (approx. $2500). In between there is a huge range to
choose from (obviously a profitable business!), most of which seem
to cost about $1500. Each has its adherents but what has gradually
come accross is that while the sound certainly does improve there
is very very limited evidence of an increase in power. Mostly just
generalised claims with very little to back them up.So go for the
sound but forget about any decent power increase!–
Myobb
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In reply to a message from Myobb sent Sun 25 Oct 2009:

I came close a couple of times to installing an aftermarket
exhaust in my 95 Corvette. But then I would read endless
posts by others complaining about the resonance in the cabin
and not being able to carry on a normal conversation with
the increased exhaust tone. Add to that a very minimal
increase in hp weighed against a pretty steep price for the
exhaust systems and installation, I always came to the
conclusion that replacing the exhaust was not worth it.

For the XK8/XKR–do you really want the car to sound like
some 1970s American musclecar?

Doug–
The original message included these comments:

In reply to a message from Morro sent Sat 17 Oct 2009:
As the owner of a 2001 XK8 Convertible I have also been interested
in purchasing a new exhaust system both for improved performance &
sound.Prices range from the JEC model (at about $400) to San Diegio
Macs effort (approx. $2500). In between there is a huge range to
choose from (obviously a profitable business!), most of which seem
to cost about $1500. Each has its adherents but what has gradually
come accross is that while the sound certainly does improve there
is very very limited evidence of an increase in power. Mostly just
generalised claims with very little to back them up.So go for the
sound but forget about any decent power increase!


SeismicGuy
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