Will cutting the fender wells affect structural integrity?
Documented on the Ford Mustang build
Published February 26, 2026
If you remove factory structural seams you can affect rigidity.
Full Answer
If you remove factory structural seams you can affect rigidity. The typical approach is to reinforce the area with welded panels or proper fasteners and seam sealer; doing the job with solid welds and proper metal backing restores strength. If unsure, keep reinforcement pieces and practice proper welding techniques.
Documented In This Build
Related Knowledge
How much wheel/tire clearance gain can I expect?What safety precautions are important?Do I need a welder or can I use rivets?How do I prevent warping when welding thin sheet metal?What wheel/tire sizes can this modification accommodate?How much extra tire/wheel clearance can I expect?How difficult is this for someone with limited metalworking experience?How much wheel/tire clearance should I leave when shaping the fender well?
Related Parts
Body filler (small tub)
$15
MIG weld wire (flux core/alloy appropriate for mild steel)
$15
Grinding / flap discs (pack)
$10
Mild steel sheet (approx. 18ga)
$60
Aftermarket fender well liners / splash shield (trim-to-fit)
$80
Pop rivets (assortment)
$10
Automotive seam sealer (tube)
$12
Primer / rattle-can (epoxy or etch primer)
$20
Underbody coating / rustproof spray
$18
Related Tools
Jack and jack stands
Angle grinder
MIG welder
Hammer and dolly set
Drill and spot weld cutter
Cutoff wheel / abrasive wheel
Reciprocating saw / Sawzall
C-clamps / locking pliers
Marker / measuring tape / templates
Related Videos
From cuts to custom fender wells on my Mustang - FINAL
From cuts to custom fender wells on my Mustang pt 2
From cuts to custom fender wells on my Mustang Pt 4
From cuts to custom fender wells on my Mustang Pt 5
From cuts to custom fender wells on my Mustang
From cuts to custom fender wells on my Mustang part 3