500 Full De-Cat!!
Discussion
Just had the car back following a full De-cat with JP manifolds and 'Y' connector. Oh boy what a noise!!!!!! Akin to a Rolls Royce Merlin/WW2 Spitfire!!!!!Anyone considering doing this, Just do it! Find a friendly MOT man and go for it, the sound is out of this world not to mention the extra torque and throttle response which is immediately evident. Straight-forward instal too, no ECU mods or anything just re-connect the Lambda sensors and away you go.Awsome!!
welcome aboard! if you can still hear me 
if you have the centre box done as well you will hit 128db (with a std car around 98db!!!)
no one beleives me...untill they hear it
nice one.
not sure about the power thing tho, possibly LOST a couple of BHP, but what you are feeling if the free reving of the engine no longer being stiffled by the cats (which are usually damged anyway!). improves throttle response and mid range power.
>> Edited by Guillotine on Saturday 5th March 22:02
if you have the centre box done as well you will hit 128db (with a std car around 98db!!!)
no one beleives me...untill they hear it
nice one.
not sure about the power thing tho, possibly LOST a couple of BHP, but what you are feeling if the free reving of the engine no longer being stiffled by the cats (which are usually damged anyway!). improves throttle response and mid range power.
>> Edited by Guillotine on Saturday 5th March 22:02
I know what you mean about the pure raw noise - just wait till you go through some tunnels and see the startled looks you get from other drivers!!
I've also done away with the pre-cats and main cat,as well as having the box sleeved,using the earlier version of JP's manifolds and Y piece - as I don't need to be able to replace the cat
(I must admit though,mine 'popped and banged like a good un' until Mark Adams worked his magic on it to smooth things out)
I've had mine for two years now and you can't fault the quality of JP's work - you won't be disappointed!
Enjoy!!
I've also done away with the pre-cats and main cat,as well as having the box sleeved,using the earlier version of JP's manifolds and Y piece - as I don't need to be able to replace the cat
(I must admit though,mine 'popped and banged like a good un' until Mark Adams worked his magic on it to smooth things out)
I've had mine for two years now and you can't fault the quality of JP's work - you won't be disappointed!
Enjoy!!
Guillotine said:
welcome aboard! if you can still hear me
if you have the centre box done as well you will hit 128db (with a std car around 98db!!!)
no one beleives me...untill they hear it
nice one.
not sure about the power thing tho, possibly LOST a couple of BHP, but what you are feeling if the free reving of the engine no longer being stiffled by the cats (which are usually damged anyway!). improves throttle response and mid range power.
Know what you're saying about the power, but......I quote.....
'We ran them on a 5.0 TVR engine.......stock from the factory...they produced a much cleaner burn throughout the range and gained around 10lb/ft of torque from 3000 rpm up to 5,500 rpm...this translates to between 4 and 10 BHP depending on where you measure it but the torque gains were most impressive. We tested against a de-catted TVR exhaust as well as Zertec, Spinning wheel and Peninsula versions and these came out best on almost all tests.'
>> Edited by Guillotine on Saturday 5th March 22:02
jrc2mcars said:
Does it still have the factory silencer?
Hell yes!!!!!! Dunno whether or not my ears could cope with sleeving the silencer as well!!!
I'll second that (extra y-piece with cat, not only required for MOT, but sanity on long journeys). In awe of people who can stand completely 'de-restricted' noise - I can't have mispent my youth correctly ;-(
Dave
He would have to be a VERY friendlly MOT man.
I'm just knocking out the pre cats (but already have straight through sports exhaust. Those two and the LS6 should be like a low flying Spitfire!
>> Edited by jellison on Tuesday 8th March 08:05
>> Edited by jellison on Tuesday 8th March 15:11
I'm just knocking out the pre cats (but already have straight through sports exhaust. Those two and the LS6 should be like a low flying Spitfire!
>> Edited by jellison on Tuesday 8th March 08:05
>> Edited by jellison on Tuesday 8th March 15:11
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