I purchased my 2008 lexus is250 6speed 3.5 years a...

I purchased my 2008 lexus is250 6speed 3.5 years ago and I have always had the check engine illuminated calling for the cat converter but only shows up during summer time , I asked the dearship if there was anything they could do like updating my pcm but my car was always kicked out until my emissions warranty had expired. Now they told me they need to replace them after its expired. Smh which tells me not buy another product . But I now I have to cut the cat converters and modify the pcm to bypass the emissions standards. If the dearship had looked into it I'm pretty sure my problem would have be resolved without any other modifications to my powertrain system. I love my vehicle but I was thinking of getting the 2019 IS but I don't want to go thru this in the future but it's time for a change to different company that would resolve these issues without jumping thru handles in the future .