Looking to remove Corsa side exit, thru-hull exhaust, and run through outdrive (normal) on 2016 280SLX...

[NicolasB]

Small hose... remove the bronze elbow and replace it with a bronze pipe plug.

A riser will raise the exhaust elbow in a system where there is a separate elbow and riser. You don't have that - nor do you need to mess with changing the height of your elbow since that's already set. You just need the correct length down pipe between the exhaust elbow and y-pipe - or modify the existing SS pipe work.

Ok, that's a good idea using a brass plug.

After googling about risers last night, I kind of figured that, but just am not really sure how to go about picking the correct pipe. Not sure if there's a way to contact a dealer to get the part number for my exact boat since they use that engine in so many different brands/models.

Hate to spend $400 for the wrong ones...

 

[Scott215]

Excellent post Bill

 

[Bill Curtis]

Thanx. Figured I'd just put the question to bed before it was directly asked. After calculating the distance just round up to the nearest riser size.

Easy Peasy

 

[Lazy Daze]

I realize I may not have explained the riser/elbow thing accurately enough. although you likely already figure this part out. While you don't have a "separate" riser, you do have a riser. However, the elbow is ALSO the riser - it's an all-in-one thing.

I've never actually measured an elbow like you have to say WHERE to measure it. It might be the distance from the top of the manifold to the underside of the elbow... how "high" the elbow is above the manifold. But again, I'm not positive.

Unless someone joins in with definitive info, check with your local Merc shop. If they don't know right away, see if they have one in stock (doesn't matter what rise it is) and figure out where the 2" (or whatever) is measured.

Once you know the dimension of the riser you have, you can order the correct downpipe.

 

[NicolasB]

So, based off of those diagrams, and me having the option of 2, 4 and 6 inch riser option for the pipe, I would guess mine is a 6" maybe? From the top of the manifold, the elbow that comes off it from factory is possibly about 6 inches tall. I'm attaching the photo again for reference:

 

[NicolasB]

I took these today. I am going to guess I need the ones for a 6" riser. This riser that is the factory manifold is roughly 6" tall, and the whole pipe I need is roughly 2 feet long, which I think is about the length of the new pipe I am looking at ordering.

Any thoughts? If they would let me return them, I wouldn't worry if they were incorrect, but they are direct from the factory, special order, so not sure if it would work that way.

 

[Scott215]

Looks like less than a 6 inch

 

[Lazy Daze]

Any thoughts? If they would let me return them, I wouldn't worry if they were incorrect, but they are direct from the factory, special order, so not sure if it would work that way.

Post #24, paragraph #3. If no joy, let your fingers do the walking. Or call Merc directly.

 

[Scott215]

Call Merc

 

[JasonM]

Nicholas B would you consider selling your Corsa exhaust kit?

 

[JasonM]

Nicholas B would you consider selling your Corsa exhaust kit? I realize this is a Searay forum, if ut would fit my 1996 Stingray 606zp with 5.7 Mercruiser