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there are tricks you can do to pass MOT and i don't mean using another cars exhaust etc.
If you don't notice a difference i suggest you time your self before and after or with a friend. There is really no way it can't make a difference unless something isn't right further up.
Pro's
-Better throttle response
-Better MPG!
-Pop's and bangs
Con's
-Loud, massively boomy on a motorway, drove to London and back, massive headache. Took it off the next day LOL. Queer!
-Voids insurance (people argue over this, but a guy on pistonheads crashed his impreza and got zero pay out due to decat) How exactly? Had he declared a modified exhaust, I'll bet he hadn't.
Yep, declared all his mods. All cars post 91 (I think!) have to have a cat fitted when built. It doesn't say that it has to remain on the car, but it doesn't say the opposite, so it's a v. grey area. Put it this way, if they refuse to pay out, I think you'd be fighting a losing battle.
No grey area, it has to be fitted by law on the production line but after that there is no physical check as part of an MOT or otherwise. The only stipulation is that the car passes emissions, I agree though that it is highly unlikely it will pass without one though. If the insurer has been told the car has a modified exhaust you have a valid MOT certificate and are paying for a policy with a modified exhaust listed they'd struggle to get out of paying tbh.