Little more info on MOB's post; {NOTE: our memory of what was built is a bit different.}The Ontario 4x1 headers were for a ZX model, I have a brand new set in a box, from 18 years ago.. unused.
They are no longer in business.. sorry..
I also have a set of the Ontatrio's {and a Delkevic muffler}.
They "might" be for sale.Jim worked up a welded assembly cutting the Ontario's and adapting them to the OEM head pipe sections.. was a lot of work, and he found no benefit, we had conversations way beck then about it..
Jim's design {OEM head pipes and Ontario lowers} worked the best of all the design's I've seen, was dyno proven by Steve, smoother power on the low end, some {but not a lot} of increased power throughout the power band, Delkevic Muffler on the right side, worked well with Steve's Torque cams.
Overall; Was the "easiest/most successful" way to build a set of 4 into 1's that I have seen.
Center stand was removed.
We recently talked about this; Jim might be open to building a set for someone... Ted made a cobbled up setup, by blocking off the left side at the end of the crossover pipe.. so everything went out the right side.. not really beneficial to performance.
As he sed; I cobbled together a setup; "Huge amount of work. {do not attempt this build!}".
The "only" original parts used were the head pipe flanges, and "Y" pipes, {everything else was hand built}, Modified muffler {with variable restrictor} was on the "left" side, head pipes were too big so reversion cones were installed to gain torque.
Overall; "gained" some peak power but lost low end, worked with Center Stand and Steve's Power cams.
NOTE: These headers are currently on Sport Rider's Nekked Connie.http://www.zggtr.org/index.php?topic=23873.msg307274#msg307274Steve tried a setup also.. and passed on it..
Steve built multiple sets of headers. Some may still be on other Connies in the club.
Like me, he didn't see much advantage on his builds and went back to stock.The Ontarios would work, but not with the lower full fairing and a slight mod to oil cooler mounting.. even with no fairing, like on my COGZilla bike, a slight cooler mod is needed...
Radiator and Oil cooler MUST be moved forwards.
Another member recently did this type of install using a set of ZX-1000 headers.Ride safe, Ted