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Hello, has anybody hack into an mc19 exhaust pipe near the muffler? Is there a smaller pipe inside or? Ive measured the main pipe and its roughly 70mm, i want to install a new muffler on it but all the 1s i see are 50mm inlet

where the 4 small header pipe the connects to 1 large pipe 70mm, could i chop it right there and weld a 50mm pipe all the way to the muffler?
 
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