i used to run 1.6 bar on a td04 but i think it was a bit too much boost for it, 1.4 will b fine, you'll love it, just make sure u really wana do it before u go through with it, so many people start but end up breaking and ends up costing them money.
had a wepr td04 kit and now running a godzilla manifold and downpipe, not had one problem with either, when your holding them you can just feel the quality, also a lifetime guarantee so you cant really go wrong
I prefer the toyos over the pradas, not tried the uniroyals yet, i found the pradas better in the dry than the toyos but not by much, pradas were shit in the wet and the toyos werent too bad, the toyos have lasted way longer than the pradas