What is the difference in exhaust for a T25 DG 1984 engine to a T25 DG 1986 engine? Can a 1984 exhaust fit a 1986 engine or do I need to purchase a new exhaust for my newer engine?
Will there be any mechanical issues or will the old still work with the new?
Exhaust
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Re: Exhaust
there's a fantastic article in the wiki explaining all of this... 
In a nut shell you can fit late exhausts on early vans but you'll need a few extra items to secure the silencer.
going the other way is even easier, just removal of the support brackets.
see the wiki

In a nut shell you can fit late exhausts on early vans but you'll need a few extra items to secure the silencer.
going the other way is even easier, just removal of the support brackets.
see the wiki
AGG 2.0L 8V. (Golf GTi MkIII)