I have dual 4inch tips. They are double walled tips. I am sure there are some others out there. I will get pics up

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Sincerely
Merlin
Kansas City CEG
99 SVT Black #1210
1/4 15.564@ 88.24 mph
KKM intake/Custom Exhaust/Fog light mod /20%tint Dyno=163.8HP,148.5FT/LBS
CHIP Dyno'd 159.3hp 154.4tq 1/4=15.502@88.95
Sho off road Y HP=171.6,TQ=160.1

Merlin

281hp 324tq
Timing 14' FP 36,24lbs,190lph,75Maf,65tb,cobra upper&lower,B303, GT-40 Crate with X al heads, Mac shorties, Off Road H,2chamber Flow's dumped, Tokico 5wys, Hotichkis Ctrl Arms, Alum Drive shaft, 3.73, Sub Frame,Steeda Tri-Ax, 94 Seats Drivers side powered.