What or where would a standard system need cutting or undoing to fit one of these spangly scorpion exhaust boxes ?? Can i do it meself or does it need doing at a garage etal:)

Sorry is on an 03 vRS fabia

Edited 21 May, 200917 yr by sifelicia
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I would hold up the new box against the old one to mark wear to cut would seem the way to go, an exhaust fitter would do the same. Only problem is lifting the car high enough to se what your doing.