No Cat on an XJS
Discussion
As far as I can gather the cat on my cat (couldn't resist) isn't really needed to pass the MOT. Worth removing? Is there much to be gained or lost? If it just squeezes out 10bhp or so would I even notice?
Thoughts?
NB - it's a '94 with a 4.0 AJ16 engine.
Thoughts?
NB - it's a '94 with a 4.0 AJ16 engine.
Edited by cml on Saturday 1st September 23:01
Hi CML,
Don't know who gave you that information but it's not stricly correct, the late XJS's with the AJ16 engines have two cats located in the downpipe section and a further two in the center section (same in theory as the X300) you also have two Lambda sensors in the downpipe section.
You will fail the M.O.T emmisions test if these cats are removed completly, what can be done is to remove the downpipe ones and replace them and the cast iron manifolds with a tubular item, retain the center cats and you'll be fine for the M.O.T
Or remove them all and have a new downpipe made up with 100 cpi cats and the rest of the system (take under the axles if you wish too) from stainless steel, this is what we would do, again it'll pass the M.O.T with these in place.
However, IMO it's quite a large outlay for minimal gain unless of course your exhaust system has seen better days and you plan to keep the car for a while.
HTH
Don't know who gave you that information but it's not stricly correct, the late XJS's with the AJ16 engines have two cats located in the downpipe section and a further two in the center section (same in theory as the X300) you also have two Lambda sensors in the downpipe section.
You will fail the M.O.T emmisions test if these cats are removed completly, what can be done is to remove the downpipe ones and replace them and the cast iron manifolds with a tubular item, retain the center cats and you'll be fine for the M.O.T
Or remove them all and have a new downpipe made up with 100 cpi cats and the rest of the system (take under the axles if you wish too) from stainless steel, this is what we would do, again it'll pass the M.O.T with these in place.
However, IMO it's quite a large outlay for minimal gain unless of course your exhaust system has seen better days and you plan to keep the car for a while.
HTH
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