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Old 03-31-2009, 05:01 PM   #1
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Default grp .21 or nova p4

I have a v-spec and want to try another brand. Which one should I get for my mbx6 a nova p4 or the grp.21 tuned version. thanks
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Old 03-31-2009, 05:08 PM   #2
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I've had all Three of those motors,
The Grp Fuel efficiency is a myth, Both my O.S and P4 got better run times,
GRP vs P4, P4 By far! better throttle response and low end torque with a 9901 pipe and smooth medium header
easier to tune and top end seems to be on par with the GRP.
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Old 03-31-2009, 05:11 PM   #3
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I picked up a P4 and have a near new GRP tuned. The P4 is easier to tune by far.
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Old 03-31-2009, 05:17 PM   #4
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P4
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Old 03-31-2009, 05:32 PM   #5
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im ordering 2 p4s tonight! thankyou all for helping me
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