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The mkiv Supra Owners Club

decat or not


mr keef

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Hey people,just wandering about the decat thing,at the moment i have a zigen5 zorst and was told by the previous owner the cats ares till there,the car is very very quiet just a little whistle on boost and hey i quite like it,but!!!! been thinking what kinda money would i be looking at to decat and also what kinda power gains do ya get from a decat?oops yea do they sound nice?

 

 

sorry but kinda new here

 

kind regards keef

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The decat pipes are approx £120 - £150 each and the second cat is easy to do and can be done on axle stands the first cat is a real pitter to get at.

 

It also depends if you are J-Spec or UK/US spec, if you are UK/US spec then just remove both and then get some form of boost control and wind it up for some great fun, if you are J-Spec then you either need to leave one cat in or fit a restrictor ring, the latter is better as the cats stop alot of exhaust heat escaping.

 

:thumbs:

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Yesterday I had to fit my mid cat back in to get ready for an up and coming MOT. My boost has dropped around 3 psi.

 

Normally I run 17 psi on full decat with a resrictor ring, without the ring it creeps up to 20 psi, which I'm not happy running on stock Jap fuel/turbos etc.

 

It's not so much the drop in boost that effects the performance, it's the way the turbos spool up. I was amazed how just putting one cat back in how sluggish the car feels to full decat.

 

Speak to Chris Wilson about a restrictor ring if you go full decat, I told him what bar/psi I wanted to run and he got it dead on.

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hey keef,

thanks for postage a message in my thread.

but seeing you started one here might as well mention here.

 

but yea, im in same situation, got a 5 Zigen exhaust.

call me stupid guys (not litterally :p), but how do i know if my car has been decat, or both decatted. :stupid: what are they infact, all i know they are long metal tubes that run across the bottom of the car.

any useful pics will be helpful cheers

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Originally posted by cookie

If you remove just one cat will it still pass MOT? and is it worth doing ?

 

Yes it will pass. I passed with just the front cat in last year.

 

Yes it is also worth doing, makes the car sound great and will raise your boost up by about 2-3 psi.

 

As mentioned above you will need an FCD. When I first got my Supra it had only the 1st cat in, it was around summer time, so I was getting away without an FCD, then the winter came and a drop in temperature and I started to hit fuel cut.

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