Custom/Hybrid exhaust tubing

Vumad

Super Hero, with a cape!
Location
St. Pete, FL
My X2 is being over hauled. I bought the new cooling tubes from the local metal place.

I went there today to buy my exhaust tubing. I told them I needed marine tubing for my exhaust. They told me they do not sell marine tubing. I was confused, they sold me the stuff before for my cooling. They said they only sell 304 stainless and I needed 316. I was pretty pissed since installing the cooling tubes was a big job.

So I've been reading and what I have found is that 316 is slightly more corrosion resistant than 304, but 304 is stronger. 316 is recommended for exhaust, while 304 for nuts, bolts and other fasteners.

Anyway, does any of this really matter? My X2 isn't a yacht sitting in the water all the time. It's used in the salt a few dozen times a year, flushed after every use, and in the fresh water a few dozen times a year. I don't think using 304 will be a problem (from what I just read). Otherwise I have to order some 316 which will take me a while to get at about 50% more cost.

Any advice from people who know more about metal? If I can't buy local, I need to order this stuff asap. Thanks.

I was worried about using aluminum that wasn't annodized, and thin walled stainless shouldn't be any heavier anyway.

Thanks.

Edit: Anything wrong with the stainless hardware sold at places like Ace? I usually use their hardware. It's stainless, doesn't specify the grade. I'm assuming it's 304 but I really don't know.
 
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Vumad

Super Hero, with a cape!
Location
St. Pete, FL

What's the corrosion resistance of bare aluminum? I had some bare aluminum on my boat with stainless bolts that didn't survive one season. (couldn't get the bolt out and the surface was starting to corrode.) There wouldn't be any stainless touching the aluminum in my exhaust. Just epoxy and silicone hoses.
 

Vumad

Super Hero, with a cape!
Location
St. Pete, FL
This good???
http://www.ebay.com/itm/2-25-OD-606...Parts_Accessories&hash=item1c2bec9714&vxp=mtr


My setup...

RN SJ waterbox

90* elbow 2.25" to 2.25" http://www.ebay.com/itm/BLACK-2-25-...Parts_Accessories&hash=item2ec490f6f3&vxp=mtr

Piece of aluminum tube cut off the through hull tube

need to find a long exhaust tube - probably use standard marine tubing because silicone is over $100 http://www.ebay.com/itm/HPS-3-FT-2-...Parts_Accessories&hash=item5aeab941a9&vxp=mtr

6063 Rear exhaust tube http://www.ebay.com/itm/2-25-OD-606...Parts_Accessories&hash=item1c2bec9714&vxp=mtr

2.25" x 3" coupler http://www.ebay.com/itm/Black-ID-2-...Parts_Accessories&hash=item3ccd68c485&vxp=mtr
B1 exhaust outlet cut to fit
140.jpg
 
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