When I did my searching about 5-6yrs ago or so for LS exhausts, KEM Equipment had a decent set up for just under $1k. Not sure what they are now but worth a call.

Here's there website:
http://www.kemequipment.com/

This seems to be what most guys run.

http://www.skidim.com/products.asp?dept=1157

I would be looking for a set of 496 manifolds. Most sets can be had for less then your parts list costs.

496?

Where would one look for these

496 on an LS???

A big block manifold wont fit an ls or they woulda been in boats from about 5 minutes after the first ls hit the boneyard...

Only thing I can think of is he's talking about the Indmar 6.0l they put in ski boats. I have searched high and low for a used set and cant seem to find any, but I dont know the inboard channels like some may know

http://www.skidim.com/prodinfo.asp?number=R028023
$232 a side without the riser
$400 a side with..

your design IS the old log style revisited. just because you can do it doesn't mean it is a good idea. you have enough fabbing work to do without tying yourself up on an exhaust project.

Just curious if anyone has fabed up a wiring harness for the LS that plugs into stock merc cannon plug.. Having oil pressure ,tach and all warnings like low oil pressure and low drive fluid and over temp?

Chris