SQL pivot, concatenate during the pivot

I'm trying to concatenate the data after the pivot

select [ARC_ID]  
from (select [MTD_ID],[ARC_ID],[MET_ARC_VALOR] from [dbo].[TB_BGP_METADATA_ARCHIVO])
as SourceTable pivot(MAX([MET_ARC_VALOR]) 
for [MTD_ID] in([1],[2],[3],[4],[5],[6])) as PivotTable
Order by [ARC_ID] asc;

I currently have this result:

|------|----------|----|-------|-----------|-----------|----------|
|ARC_ID|1         |2   |3      |4          |5          |6         |
|------|----------|----|-------|-----------|-----------|----------|
|105   |25.020.158|Casa|Prueba1|Certificado|cara\objeto|2011-07-06|
|------|----------|----|-------|-----------|-----------|----------|

I'm looking to do this:

|------|---------------|-----------------|------------------|-----------------|----------------------|-----------------|
|ARC_ID|1              |2                |3                 |4                |5                     |6                |
|------|---------------|-----------------|------------------|-----------------|----------------------|-----------------|
|105   |RUT: 25.020.158|Institucion: Casa|Documento: Prueba1|Tipo: Certificado|Direccion: cara\objeto|Fecha: 2011-07-06|
|------|---------------|-----------------|------------------|-----------------|----------------------|-----------------|