Doubt there is a warranty. I had them setup years ago, but just got the car on the road under 200 miles. He never gave me a pic of pattern.
I did take the car back due to a drive line vibration and he said "you're rear gears are whining" I said you set them up and he then replied well aftermarket gears always whine... You have to find factory gears.. I just shook my head
I was going to try and re do it myself or find another shop.