(sorry about the delay) Its actually quite smooth, even though if I brake real hard I can stall it. At 900rpm its seems to be idling too fast.
New exhaust has been fitted, 2 1/4 inch from the collector in the extractors to the very end of the tail pipe. Torque increase has been quite good

and it has become a nicer car to drive with less noise (and or rattles inside) and more exhaust noise.
The new exhaust has to 45 degree bends instead of the two 90's

But its not all good news, I have discovered the gearbox is leaking oil[}:)] and the seals are only 2 yrs old, and where I have been parking at TAFE now has oil spots