Yea the biggest problem with this turbo is has a 4" vband on it from ATP just the flange and clamp its like $50. and then to get a reducer from 4" to 3" is another $20. then a stainless J bend is $25
If you wanted to stick with 4" then it could get expensive with the parts. 4" is not very cheap.
Just the parts alone put you at almost $100. unless you can have misc scrap peices…
To use a v-band instead of that stupid 5 bolt or 4 bolt is well worth $50 to me. I have yet to see and “easy” 4 bolt or 5 bolt flange to install or remove.