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GM 3 port or Grimmspeed

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Old Dec 25, 2010, 02:24 PM
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GM 3 port or Grimmspeed

I am looking for a 3 port but wanted to hear stories on which is best in regards to durability reliability etc

Post up reviews
Old Dec 25, 2010, 03:22 PM
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wrong section to post in
Old Dec 25, 2010, 04:38 PM
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I liked the gm 3 port. Is working in my two subarus very good, since one year. No failures.
Old Dec 25, 2010, 05:24 PM
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I prefer the GM.
Old Dec 25, 2010, 08:46 PM
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what about the perrin
Old Dec 25, 2010, 09:11 PM
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Originally Posted by Boosted Tuning
I prefer the GM.
why is that?
Old Dec 25, 2010, 10:30 PM
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Originally Posted by ODUB
why is that?
Its smaller. I feel its easier to tune. Not the biggest fan of the smaller barbs on the grimspeed. I like the more OEM quality/look of the GM. Etc.
Old Dec 26, 2010, 12:51 AM
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Just got tuned by Jay on GM 3-port holds boost really good and looks stealth always important here in Cali
Old Dec 26, 2010, 09:04 PM
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What is needed to make the gm one ( any cutting or splicing?
Old Dec 26, 2010, 09:49 PM
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Originally Posted by silverevo05
What is needed to make the gm one ( any cutting or splicing?
SpoolinUp sales a PnP harness for the GM 3port, so there no cutting or splicing needed,
Old Dec 27, 2010, 10:15 AM
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Grimmspeed all day
Old Dec 27, 2010, 10:33 AM
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Why grimmspeed ^


And does the PNP from spoolin up have the resistor so it does not draw too much from the ecu?


DOES the boost pill need to be removed for these?
Old Dec 27, 2010, 11:52 AM
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Originally Posted by silverevo05
Why grimmspeed ^


And does the PNP from spoolin up have the resistor so it does not draw too much from the ecu?


DOES the boost pill need to be removed for these?

The spoolinup PnP can come with or without resistor.

When using a 3port, you need NO boost pills.
Old Dec 27, 2010, 11:58 AM
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I want to see some reasons as to why GrimmspeedBCS>GM BCS or GM BCS>Grimmspeed BCS. Not just oh, this one is better.

Which one holds boost better? It was said that the GM was easier to tune-How So? etc
Old Dec 27, 2010, 12:00 PM
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i got the grimmspeed but have not fitted it so cant say if its good
its a mac valve made for grimmspeed
i got it because its PnP and has a fitting bracket ,piping etc


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