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I'm going to be ordering a performance Y pipe and hige flow cat from BAT soon as my main cat is breaking up,what are peoples experiences wityh gutting the std pre cats on these engines?? Is it worthwhile?? Will i still pass emissions with just a high flow main cat?? Thanks..........(and no,I'm not buying headers-too much $$$$$ spent on this car already) 
Mondeo V6 RS
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Gutting the pre cats will add considerable noise and cabin resonance. Passing MOT is questionable. Try MEG for input from people on your side of the pond, or contact Terry Haines.
Mark (fomer Essex resident and Mondeo owner)
Semper Fi
"They've got us surrounded. Poor bastards." -Chesty
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Thanks Mark 
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I'm not sure how your country's emmissions work, but over here our cars would pass the "sniffer" test w/o precats and a main cat. What if you got a performance ypipe with no cat and left your precats intact? 
Derek
Scion xB 5-spd
Previous: 2000 Silver Frost SVT
Please share the road with cyclists.
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CEG\'er
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I've been told i won;tpass without the main cat,should be OK with gutted pre cats-Is it really worth all the hassle though?? Anyone on here have any dyno plots b4 and after gutting them??
Mondeo V6 RS
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My opinion is to skip the gutting. The performance gains are negligable for the trade off in noise.
Semper Fi
"They've got us surrounded. Poor bastards." -Chesty
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Originally posted by Mondeo V6:
I'm going to be ordering a performance Y pipe and hige flow cat from BAT soon as my main cat is breaking up,what are peoples experiences wityh gutting the std pre cats on these engines?? Is it worthwhile?? Will i still pass emissions with just a high flow main cat?? Thanks..........(and no,I'm not buying headers-too much $$$$$ spent on this car already)
Too bad. A set of headers is well worth the money. Keeping a free flowing main-cat and an open resonator is also a good idea.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
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'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black
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Originally posted by warmonger:
Too bad. A set of headers is well worth the money. Keeping a free flowing main-cat and an open resonator is also a good idea.
Exactly.
By "open" resonator he means one that uses a perforated core (not louvered) and retains it's full inner diameter.
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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Well the car already has a stainless free flowing performance exhaust so i think i'll just stick with the cat and Y pipe (Only buying this because the main cat is breaking up  ).Gutting the pre cats sounds like a lot of hassle and if the trade off is more noise and not much power then it's not worth a day under the car
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I recently mystery modded & found that I have very little extra noise. I noted a touch more drone, my wife didn't notice any change - she's the one with the good hearing.
Much of the volume from headers can be dealt with by sizing & type of exhaust components. Keeping the main cat will quiet things considerably, add a nice muffler behind it & perhaps something like a resonator or another muffler at the rear & you should be in good shape.
Must be that jumbly-wumbly thing happening again.
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