Cat Removal On 2003 Gs430

[Evil Nuts]

Howdy all, my GS430 esxhaust is mainly weld and bog now, was wondering if anyone has or knows if I remove all 3 cats will the EML come on or will it have a effect on the engine running.

Cheers in advance.

Chris

[scudney]

if I may ask what are you trying to do or achieve???

[IanA2]

AFAIAW you will increase performance, reduce consumption and fail the Mot.

[Evil Nuts]

Whats afaiaw??? Not really bothered about consumption....and the MOT aint a problem as I work at a Toyota dealer, as for what im trying to acheive.....not much....the cat bolts are getting ropey so I was just wondering of lack of cats would bring the eml on....I suspect yes as there are O2 sensors after them. A bit more V8 noise would be nice.

[IanA2]

Should have been AFAIAA = As Far As I Am Aware

[Evil Nuts]

Ahhhhh....I see

[dave1]

...and the MOT aint a problem as I work at a Toyota dealer,

So why would working at Toyota dealer affect MOT ?

[ColinBarber]

Yes the EML will come on. There is an O2 sensor after the cat which checks for correct operation. You would have to plug in an O2 simulator instead to fool the ECU that the cat is there and working correctly.

[Evil Nuts]

Just an update, managed to find a cat back system on e bay from gent on here from chesterfield, it's a Cobra system and sounds great, Quiet on idle and cruising and sounds like thunder when on WOT.

Just got to recitify a few niggling faults else where on the car now and covert it to Sport spec.