The problem is, I believe under engine braking or decelleration, a fairly large vaccuum is created in this area. Use anything flimsy and you risk it getting torn apart/sucked into your intake into your engine.
1/32" Aluminum or Tin, is VERY easy to cut, buy a $5 pair of tin snips.. you might not even need those, its just what I had handy.
You could probably whittle the whole thing out with a dremel if you had the time.
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2003 Mustang Mach 1
Torch Red, 5-Speed
w/ IUP
Steeda Tri-Ax
Steeda Sport Springs
UPR Adjustable LCA's
Offset Urethane Rack Bushings
Maximum Motorsports Full Length SFC's
Ford Racing 4.10 Ring/Pinion
JLT CAI
Ported/Polished TB/Upper Intake
PHP Intake Spacer
NGK TR6 Plugs, Gapped @ .050
MAC O/R Prochamber
Borla Stinger Exhaust
SCT Custom Tune
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