Basskika

Both are good .. I am running the Koyo but have heard many good things about the Mishimoto - isn't supposed to look as good, as mentioned by Voodoo_S2K, but in terms of cooling from what I have heard it is supposed to work just as well.

JDM_JOE

Shop around and get a good deal on a koyo. Not saying it will mess up but you will be kicking yourself later for not spending that extra $100. I hate being the test mule

Chris_Lum

[QUOTE=NFRAP1,Sep 28 2008, 08:40 PM] I have the mishimoto.

NFRAP1

Thanks for the info Chris! My mishimoto cap has been leaking since day one. I just ordered a J's cap, in the larger size.
I know it's gotta just be the cap, because I had a pressure test done and it held great with NO leaks anywhere.

markeymark13

Do you know if i need to get the same mugen cap as i would for the koyo? I know you need to get the different one for the koyo.

akimoto

How can you tell that your cap is leaking? Do a pressure test?

I haven't lost any noticeable amounts of coolant, its dropped from the top of the line in the overflow to the bottom of the max line (1-2mm). My problem is that I still smell coolant sometimes after driving for a while.

Do you think its the Rad cap?

If I order the J's racing cap, do I just ask for the larger cap?

NFRAP1

Yes, I did a pressure test and everything was perfect. Looking at it, I thought it might of been leaking around the neck (welds don't look so good). But, the pressure test was good so I'm assuming it's just the cap. I ordered the larger size J's cap, so I'll let you know once I get it.

Ness2000

Koyo fits a CTSC + Ultimate Racing intercooler just fine.

I only upgraded because my old one cracked.

truancy143

I know generally speaking that if something ain't broke, then don't fix it.

But if one lives in a hot environment, (SW US) would this mod be worth the money or will stock do just fine? I've heard that the stock cooling system is sub-par but I haven't seen any data to back claims that either radiator will reduce temps significantly. I was hoping someone who has a koyo or mishimoto radiator can better explain the benefits over stock.

Is the bang worth the buck? Can anyone give me some insight?

Voodoo_S2K

You heard wrong. The stock cooling system works great. I've done track days in 105+ degree heat and not a worry in the world.

If you are N/A, not anything to be gained over OEM, except bling . No need to replace unless your OEM is broken.