  We propose to use the thermal X-ray emission from young supernova remnants
(SNRs) originated in Type Ia supernovae (SNe) to extract relevant information
concerning the explosion mechanism. We focus on the differences between
numerical 1D and 3D explosion calculations, and the impact that these
differences could have on young SNRs. We use the remnant of the Tycho supernova
(SN 1572) as a test case to compare with our predictions, discussing the
observational features that allow to accept or discard a given model.
