I have ran without Isos before and I used the tape method plus a liberal amount of lubricant and never really had any noises. I used the lube to help prevent any corrosion. I really need to find pics with and without isos on these springs but with 17" wheels I guess. We all know 18" saleens look bas add on these cars as both of those pics show and the fender gap with them is a good bit less than with 17's. I wish I had kept my brand new saleens I put on my supercharged 01 before I sold it. The wife was right. Ya I said it, I shoulda kept that car instead of buying a Damn s2000 lol. But it did intoduce me to road course racing and now I am hooked haha.