hi guys thinking of decating my ff l322 m62 v8 along with an lpg system , i have decatted p38s with no problem as they only have precat sensors but the l322 has upstream and downstream sensors , i know the new mot rules may hinder this but i will cross that bridge when i come to it
i would be very gratefull of any help on this ssubject 2004 4.4 v8 vogue se

I have had two eBay buyers turn up to collect things in decatted 4.4's and they were very happy with their sound... Stood outside both cars i think they sounded ridiculous IMHO. I live on a fast road so at times you have to accelerate hard out of our driveway...

I have a decatted SC FF, i was nervous about this conversion as i didnt want mine sounding like an old boy racers corsa... And, it didnt luckily... I was told its because of the way the Supercharger disrupts the air, thats why its quieter and deeper in sound...


Craig  06 SUPERCHARGED VSE
2012 Facelift
Overfinch Conversion
22" Overfinch Alloy's & GAP Lowering Module
Jet & Ivory Interior with RE & Hybrid TV + LR iPod Kit
BRC LPG

It.s been talked about on here quite a lot recently and with the new MOT regulations that just came in to force , if a vehicle had a CAT fitted at manufacture and it has subsequently had it removed that is a straight fail . 2008 MY Supercharged
Rimini Red / Jet
four zone climate
remote park heater
and no ugly kid widows.
turpis magna satis, satis

^^^^^ What he said, with the proviso that the car being tested is subject to a full cat test. Some older petrol engined cars had cats fitted at manufacture but were not subject to a full cat test.
Petrol and lpg engined cars are subject to a full cat test and will need the cat in place to get an mot. Nothing to do with whether they sound nice without a cat or not.

Is anybody aware of whether sports cats are available for the FFRR? If so would they still be caught out by the new MOT regs? 2006 Supercharged

thanks guys , not sure what to do at this point i do have a project kahn exhaust on my ff at the moment and it sounds great maybe a decat might be to loud inside the vehicle 2004 4.4 v8 vogue se

Why not cut out the oem cat and weld flanges on the exhaust and cat and make a de cat pipe that will go between then all you have to do mot time is bolt in your cat i will never surrender to bling , mud and dirt all the way oh yeah . and pheasent blood in the back.

I'd just find somewhere breaking a 4.4 and see if they have some used cat's instead Bash the guts out and away you go.

When it comes to emmissons at MOT time if you have LPG installed they only do a smoke test. this is from personal experience and from what i've seen of the new rules its not changed.

yes they check for a cat, but if the box is there they wont take it off to check for internals

problem being if its a project khan exhaust that includes freer flowing cat's then replacement ones will be a mare to find, so the flange weld in option would be the only way but is a faff for every MOT to climb under the car before and then after the MOT to swap them about...

kingpleb wrote:

I'd just find somewhere breaking a 4.4 and see if they have some used cat's instead Bash the guts out and away you go.

When it comes to emmissons at MOT time if you have LPG installed they only do a smoke test. this is from personal experience and from what i've seen of the new rules its not changed.

seems like a lot of hassle to me for a few bhp ....get sports cats - you can get them custom made for any car for a few hundred quid...but you need 2, so it could be £7-800 for about 5bhp that you wont even notice on a 2.5ton vehicle  cheers
bogie