Engine radiator MISHIMOTO or Koyo

this Mishimoto unit had a VR6 attached to it!

Bought a Koyo rad for my na. Fit like a glove and it's hand built "from what I've heard"

My koyo was bought secondhand, has done many track days and 40k street miles over 5 years, and I even accidentally tried to jack up the car with it. It's still going fine.

I’ve got Mishimoto’s X-Line radiator. It’s an absolute beast of a rad. I’ve had mine for 7 years of daily driving and track days, and I’ve had zero problems with it. I fully expect it to last for the life of my M3.

Not everyone has great things to say about Mishimoto rads, but from what I can tell their X-Line rads are built very well.

my mishimoto looks in really good shape with some pretty decent welds imo.

Mishimoto has been working great for me.

I blew my stock one around 60,000km, then the STI replacement around 100,000km. Fixed the issue with a Mishimoto aluminum rad.

With that taken care of reliability concerns would be pretty minimal and the core itself should be an improvement. I even confirmed with Mishimoto, in writing, that modifying the quick connects would NOT void my lifetime warranty with them.

Mishimoto radiators aren’t the best. IIRC, a lot of their stuff comes the same factory as a lot of eBay brands.

Wouldn’t recommend mishimoto, the warranty is nice but some of them tend to be leaky (haven’t just read that online, have seen multiple leak firsthand).