I have been having lots of problems with ripping tubes with these slicks ( I have 20's on 14 in steelies). I have used the rim screws and I am still having problems. Can I run these slicks without tubes and not have any problems. They are way too small for my setup, but this is all i have right now.

 

you dont need tubes with the M/T 20x8x14's
also rim screws shouldnt be necesarry.

I think you just have to upgrade on the size of slicks.
on your Sig, you have a turbo setup, I think its time to step up to a 22x8x13 or even 24.5x8.5x13.

 

Dont get me wrong I have been drooling over many a sets of 13X8's with a larger slick mounted on them but they are very pricey.

Yes I have an LS running about 8lbsof boost

 

you need atleast 22" rims, save the 20" slicks for us SOHC folk.