I have one of Jesse’s 4” extensions. I have beat the heck out of mine for many, many hours and it is holding up great! A very well built, solid unit. Jesse is a super solid guy who will do right by you.
I agree with Enigma, Jesse won’t steer you wrong on the extensions. I have two, the one piece and two piece. Both have been bomb proof for me. Remember to use two quarts of Kawie wet brake rear end oil.