I've installed two sets of front and rear pipes purchased from the Bus
Depot in the last six months on two '84 Vanagons (one with a 2.1 engine)
and found the following:

Both fit onto the heads with minimal fussing, but both front pipes were
slightly short of meeting up with the J-pipe and had a slight angle on
the mating flanges.  This was accomodated for by using two gaskets on
this joint along with a smear of high temp silicone between them. The
rear pipe lined up perfectly.  At least they seem to be consistent, if
not perfect!

After 9,000 miles two of the tabs welded on the flanges for the support
brackets on one of the rear pipes cracked and broke off.  I rewelded
them.

I would order an extra two-hole gasket along with the front pipe, and
beef up the welds on those support bracket flanges before installation
next time.

All in all, these are well worth the price.  Only stainless would be
better, but 3X the cost (if it existed for the 1.9) is a big jump in
cost.
--
Stuart MacMillan
Seattle

'84 Vanagon Westfalia w/2.1
'65 MGB (Driven since 1969)
'74 MGB GT (Restoring)

Assisting on Restoration:
'72 MGB GT (Daughter's)
'64 MGB (Son's)

Parts cars:
'68 & '73 MGB, '67 MGB GT