I have 4” 15% reduction super Atv portals. I have had nothing but problems. Everyone talks about how great the customer service is, so that’s why I went with them. When I first installed them and took it out, it shakes so bad I thought it was going to fall apart. Looks like I got a bad batch of hubs and rotors. The sent me new ones. Seems to be fine now for the shaking part at least. Not to mention one of the rotors had such a high spot it made a big groove in the center of my caliper. The last two trips I have been on each time I have had a seal go out and start leaking. One on the front now one on the back. Prolly a total of about 500 miles on them. First time super Atv sent me a replacement seal no problem. This second one is seeming like a bit more work. At the rate these are leaking they should just sell seals separately. I’m only needing the seal that goes in between the to halves of the portal box. I’m hoping super Atv will return them and swap me out for a new set of portals. I don’t know if they all suck or I got a bad batch.