Who edited the thread on the J-pipes? These are still available, I'll find the site I bought it from and post it.
I put one of the HKS units on my Capri the day before I cracked a piston. I think that is why I smoked it. I usually turn down the boost controller after I do intake or exhaust changes to see where I land, this time I didn’t. I will tell you it did make a difference in the way the engine ran, right up till it broke.
Lesson one TURN DOWN THE BOOST every time you make a change!