hi, i have recently fitted a milltek cat bak exhaust to my golf gti 8v 1997 agg and when coming to fit the de cat pipe to the down pipe the original bolts are 13mm head and the new ones 16mm head ,do you have to drill out the holes to fit,i have been advised by several milltek agents that it is the correct pipe,part number msvw118.please advise ta.
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