I have mthfr gene mutation and heard most women with this develop breast implant illness upon getting them done?

The Institute of Medicine looked at all the data and said they can find no evidence that ruptured silicone implants cause any systemic illness in women.  It is estimated that 10-15% of the adult female population has breast implants.  I feel that if there were legitimate concerns that we would know them by now.Good Luck!

Silicone implants are safe. Period
Breast Implant Illness  and silicone related medical complications are controversial topics. It is a phenomenon which is supported by a wealth of anecdotal data (patient testimony) but no empiric data  (hard scientific research). Patient reports a litany of symptoms which they attribute to their implants but the connection is difficult if not impossible to prove via laboratory study.
Physician scientists may recognize anecdotal data but unless it is supported by Class I empiric data, it is difficult to place a great deal of faith in it. Clinicians make decision based upon evidence based medicine. 
That being said, it is easier to identify what one knows rather than what one doesn't.
What we do know is that by all available measures today...implants are safe and specifically silicone implants are safe.
Silicone breast implants are among the safest medical devices in use today. These devices are also among the most rigorously studied and tested medical devices currently being used in the U.S. today. It is biologically inert  and in that respect no different than the titanium used for bony fixation. There has been no demonstrated link between silicone and the commonly cited myth of autoimmune disease.
With regards to your specific question, I am not aware of any connection between your gene mutation and BII. Ultimately it is up to patients to decide what sources they choose to believe. Those who believe they suffer from BII are vocal and the accounts of their suffering are readily available to most (via the internet). The sterile scientific data regarding silicone implant safety is by contrast less available and not as easily consumed by the average individual. That being said the hard scientific data is no less voluminous. There are as many (if not more) fact based studies and data points as there are those who believe they are suffering from BII. 
As always, discuss your concerns with a board certified plastic surgeon (ABPS).

I've seen estimates that up to 30-50% of people may carry this mutation, but it certainly doesn't affect 30-50% of women with breast implants. The concept of BII is not well understood. I have performed capsulectomies and implant removal on many women who feel they have BII and unfortunately, not all of them get better. The symptoms related to BII are very vague and can be attributed to a multitude of issues. At this point, I wouldn't let it stop a woman from getting implants. We just don't know enough about it yet. Good luck!