CK5
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Later this week, I want to weld a exhaust flange on and get a new cooler.

Speaking of that how do I weld on the flange with my mig, I'm not sure what kind of pipe was used. I don't think it's aluminum but it has the color of it? Will my 75/25 mix work?
I use a brown Roloc disc on a 90 degree die grinder, the same ones for buffing off gaskets and just buff off the aluminum until you see the steel. Otherwise it will give you a real shitty contaminated weld. All semi exh and intercooler pipes are made of that stuff and I've welded a ton of it over the years.
 
Now next question, what do you guys recommend for a cooler? I just had a stacked fin plate cheapo. Should I go with a tube and fin style? Fan or no fan?
 
Have a link to what you are suggesting? I don't know much about coolers other then they cool fluid down.
 

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