Ziscos older work is excellent, running a mild steel zisco manifold and a zisco stainless decat which I had to cut the bracing off to fit the manifold, these are both older productions of his and are good quality however. Bought a new zisco screamer off them and it was shocking, spits everywhere and poor welding of the division so was blowing like hell, also the lambda sensor threads were full of spots and were actually different threads to my sensor! Would never buy exhaust parts off them again unless they were older productions.
And the bracing on the bracket didn't line up with the gearbo