What does removing the internals do? I tried searching but couldn'tfind any thing
You take the downpipe off the car and smash out this chalky substance from the very top end of the downpipe. Reduces exhaust gas temperatures, produces a slightly deeper note to the exhaust and best of all doesn't fail on MOT.
Alternatively, get a bigger downpipe, which would mean you would have to go stage 2 on a remap as there's more flow than standard downpipe and the sensors won't like it
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