Yeah the 3.5" like I have come with labels that state
FOR DRAG USE ONLY. I have run them for 5 years now with only one problem, I had bought the fronts from a friend and the one had a little dent to the bead, it fianlly cracked I assume from all the street driving. I replaced the rim and haven't had any issues. The 5.5" Weld would make a better skinny, but I like the look and weight difference of my 3.5". I run P165/15 tires on my 15" x 3.5" Draglites.
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Check Out My Site 91GT,Holley SysteMAX II Kit-Heads 2.02" x 1.60" port matched to a 1262,Anderson N-61,24#,76mm C&L,Full MAC exhaust 1-5/8" Long tubes,2-1/2" O.R H-Pipe,2 1/2" cat back, No A/C or PS or emissions, 12" K&N Filter,RNH PERFORMANCE Ram Air,Ron Davis Radiator,Full Suspension,S&W 8pt "X" brace,JAZ seats,3:73's,Welds..etc,4:30's and 31 splines coming very soon!
FIRST TIME OUT 12.16@111 WHEELS-UP