after you get longer studs you can use 5mm spacers with no problems. if your lowered, i would go any wider than that. the SVT wheels have a 49mm offset. the 5mm spacers will give them the look of being 44mm offset. i believe you can go as far as 42mm of offset before you run into rubbing issues. this of course is on a lowered focus.
im on Tien S-Techs
i have a 42mm offset
i dont rub!
take a look in my gallery for this combination