156 JTD 20V exhaust/decat question? - Alfa Romeo Forum
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156 JTD 20V exhaust/decat question?

Hi guys, I've been trying to workout what decat pipe I will need.

Would you like to first check the inner diameter on the beginning and the end of your cat as most 20vs only have 54mmm opening and the standard Alfa pipe after the cat is the same diameter for all off them,10v or 20v
Awaiting your reply
That's what AlfaTuner said...But I will not be able to check that soon so any info is appreciated.

From what I've heard the diameter should be 63mm but there is a notable narrowing around the CAT + what Alfatuner said...?!
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