For the Evo 7-9 ECU, there are no known ECU faliures when running the GM BCS without an inline resistor. The Evo 10 ECU is likely the same, but its not proven yet.

 

So the resistor that comes with the first link is not enough?

I need to make a choice now on what 3-port to use. (Retune)
I'm between Perrin, Grimmspeed and GM.

I know Perrin and GS are plug'n'play, now GM + harness is too.
I read GM perform best, GS uses MAC valve.

Can someone give their opinion

 

^^^^ Are you saying the perrin one plugs straight into the evo X harness with no need for a spoolinup harness adapter dealie? Thanks!

 

No, but it comes with the harness adapter dealie.

They really all seem plug'n'play now.

That's why I'm trying to figure out what peoples comments are.

 

I saw a grimspeed BCS on ebay with a connector for EVo X for a 100 bux...not bad I think for everything, but why is the GM BCS better?

 

I'll be bench testing a Grimmspeed sometime over the next few weeks.

 

Sweet!

 

I run the GM BCS with no resistor... I have no issues or CEL's thus far.