Join Date: Sep 2015
Location: Lindsay, Ontario
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I would hardly worry about any danger, would take a LONG time to rot out, even in salt country.
HOWEVER, there is no logical reason not to weld it closed, in fact, I would personally never cut a hole in any subframe or unibody structure without repairing it by welding it. It would be very cheap to have someone weld it or if you are like me, I have a little MIG welder that would do the job and I am definitely not to be considered a skilled welder by any means.
This is an easy fix, cut a hole and weld it up when you are done. Ask any mechanics about Neons/PT Cruisers and replacing the control arm bushings. I got so good at them all I did was use a hole saw and stick the tip of my MIG in and booger that nut back to the body, lol. I could do them in less than an hour, both sides. I was a used car dealer's mechanic, he sold far too many of those damn things...
2004 Mazda 6s 3.0 5dr. 5spd never ending money vacuum project:
CP-E headers w/catted mid + Magnaflow carback/AEM CAI/3.7L TB/Speed6 springs/RX-8 wheels
AWR 70D Enginemount/CP-E Dogbone/Custom urethane stock trans mount
Ralco shortshifter/Bose w/Auxmod/sharkfin antenna/lots of little things...