http://xu10j4rs.free.fr/Photos%20Xsara/xu10j4rs/collecteur.jpg
I've got a head from a 2001 xsara vts with exhaust manifold like the one in the picture above.
When fitting Mi16 engines to 205 here in Finland we have found that most difficulties can be avoided by simply dropping the engine down 1-2cm (steel plate under the right hand engine mount on the engine side and shim down the gb mount) and by adding some lenght the the fork behind the engine between the engine and the subframe. This will tilt the engine a bit but makes the original exhaust clear the bulkhead. And by experience (from Mi16 engines) it won't affect the engine oil supply or anything soo much. Not many people here have done this conversion I'm doing but many of you around here have from what I've looked around.
I guess tilting is needed with the RS engine also to clear the bulkhead. But will the intake manifold clear the cooling rad? As a Mi16 intake comes very close.. The thermostat housing issue is known and sorted.
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306 S16 "Peugeot Sport GrpN" '94, 405 Mi16 "OEM+" '89, 605 SV24 "Executive Express" '91