? about plumbing EMI headers.

[Mr. Crusader 83]

My dads boat had the stock Mercruser Exhaust Manifolds on it with teh S pipes. Do you have to change any of the plumbing to switch to the EMI Thunders? Or does it all hook up the same way?

[BDMar]

Need to know what thermostat housing you have. 2 or 4 hoses leaving the housing.

[Mr. Crusader 83]

454 mag, bravo 1, 4 hose thermostat

[BDMar]

Both hoses on each side of the thermostat housing will go into a "Y" then one hose from the "Y" to the bottom of the EMI manifold. You can purchase the "Y" from them at the same time you get the manifolds/elbows. We might be able to help you out on the cost...