So how do these hold up on lowered cars?

 

No problems there is a little nook where the cutout on the I pipe can go with no sacrifice in ground clearance. Your torque arm or differential would scrape before the cutout.

 

I bought my DMH cutouts from DMH and have had no problems for the past 4 years...they have a 4 year warranty and are the only company with a warranty that long...most of the others are one year warranty...Dave the owner of the company is who I delth with over the phone and my order was shipped and delivered in 3 days. I put the switch in my ashtray.