Series4 IC compared to Series5
 

Does anyone know if the series 5 top mount intercooler is a better unit than the series 4?
Is the air intake any different in size for the two models?

Yes, the S5 intercooler is a bit better than the S4 one. The connections are the same size but the internals tubes actually have greater internal cross-sectional area, so there is less pressure drop across the core. I've seen a test where the S5 intercooler flowed ~5% more than the S4 one, so there's not much in it really.

actually no, according to the autospeed webpage intercooler tests the S4 one flows better than the S5 one

Same shit... different pile.
Nah, I'm just joking, they are decent intercoolers.
The difference between the two is to small to make a noticeable difference (ooooh! 1hp) ;)

Nah, they just had them mixed up, it was discussed in the forums. The S5 IC has bigger internal tubes, if you compare them side by side they're quite a bit bigger. It'd flow really well with bigger connections.

Has this bigger internal tubes thing really been confirmed???

The Kouki IC has a 2" inlet, while the Zenki IC has a 1.75" inlet.&nbsp This could be the 5% flow efficiency gain...



-Ted

You can easily confirm it yourself. Get one of each and look in the outlet, it's quite easy to see. Maybe someone can post nice clear close-up shots looking into the outlet so we can see the tubes. I'm sure we can get one photo of each.