you can also check over at
http://www.ka-t.org and search around for jordan gladman. he makes custom ka24e manifolds out of his shop. i have one and it looks great. i have not used it yet but he has one on his kae-t and is making around 400 hp so they are durable.
http://cgi.ebay.com/ebaymotors...40244
this is just an example of what they look like. i bought a sidemount from him but this one is a top mount. they look great and the welds are strong. nice thick tubing also. so he might be the guy u want to talk to. he can pretty much do anything u want for the ka-e.