[adinstoes]

Hi everybody, I was looking into upgrading my stock intercooler to either the VRSF 5” HD or the VRSF 6” Race in my ‘14 435xi. I am currently on a stage 2 mhd tune with a catless downpipe and chargepipe (experiencing bad heat soak after spirited driving).

VRSF labels the 5” up to 600whp and the 6” up to 800whp. I am not planning on upgrading the turbo, therefore the 5” seems fit for me. However, I have seen others saying that the 5” is not enough for aggressive stage 2 driving while others mention that the 6” is too much for stock turbo causing turbo lag.

Any pointers on what to choose?

[Slumped335]

I’ve been wondering the same thing. I feel like the HP rating is a bit confusing. They both say they would support stage 2 based on the HP rating but i’ve seen the posts saying that the 6.5” is the better one.

Anyone got some good technical data or anecdotal information?

[NEWTRON]

The best performing intercooler is the 7" race version from VRSF or MAD. There is no turbo lag with either. Theres no reason to go with a smaller option.

[thejeremyman9]

Originally Posted by NEWTRON

The best performing intercooler is the 7" race version from VRSF or MAD. There is no turbo lag with either. Theres no reason to go with a smaller option.

This is the answer. I ran the 5'' HD for a couple years and eventually went with the race. Big difference. The 5'' is fine for about 5 seconds of WOT but then it can't really keep up.

Here's a log with the race from 0-150 mph: https://datazap.me/u/thejeremyman9/d...0&data=4-10-17

As you can see, zero increase in IATs

[mike@x-ph.com]

As mentioned above, for the best result, get the race intercooler instead.

I'd go with the MAD Race

[n55david]

MAD race or vrsf race.. MAD is much more active here if you should have an issue.

[adinstoes]

Thanks to everybody for the information. I’ll be looking into the mad race👍

[mike@x-ph.com]

Originally Posted by adinstoes

Thanks to everybody for the information. I’ll be looking into the mad race👍

Let us know how it goes