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Exhaust Mods/Upgrades

120K views 340 replies 44 participants last post by  Theo  
Gentlemen, I'm fresh after installing the CatBack exhaust from MG MotorSport (A45S).
It gets better but this is not it. I read the whole topic from the first page and I don't know anymore. Of course, I want to keep the guarantee.
Does anyone know about a new method that will leave a warranty and at the same time increase the volume of the exhaust without errors in the ECU?