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Upper Intake Manifold plenum worth it?

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Old 08-10-2017, 07:04 PM
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Upper Intake Manifold plenum worth it?

Hi, I am new here, I just signed up today. I have a question about purchasing/installing an ebay Shift Works or Kinetix Upper Intake plenum manifold on my 2003 Infiniti G35 Coupe with 5-speed automatic transmission. I am wondering if this modification is basically worth the nearly 270 bucks they are both charging on ebay as far as gaining solid horsepower and torque or if it is better to just wait and save for the MREV2 lower intake manifold on my daily driver. I currently have NGK Iridium plugs, an ETD, an Injen CAI, and a 5/16 intake manifold spacer as far as bolt-ons and am looking for more to add power and performance to my daily driver. Thanks
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Old 08-11-2017, 12:54 AM
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Brad, since you're new read all the stickys at the top of the coupe page!

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Originally Posted by brads350gt View Post
Hi, I am new here, I just signed up today. I have a question about purchasing/installing an ebay Shift Works or Kinetix Upper Intake plenum manifold on my 2003 Infiniti G35 Coupe with 5-speed automatic transmission. I am wondering if this modification is basically worth the nearly 270 bucks they are both charging on ebay as far as gaining solid horsepower and torque or if it is better to just wait and save for the MREV2 lower intake manifold on my daily driver. I currently have NGK Iridium plugs, an ETD, an Injen CAI, and a 5/16 intake manifold spacer as far as bolt-ons and am looking for more to add power and performance to my daily driver. Thanks
No, it's not worth installing either one! You can quit saving your $$ for the MREV2 manifold, cost isn't worth the increase in WHP if there is any! So far the only mod you've made to increase HP is the plenum spacer! Since you're looking for HP increase your next mod s/b a quality cat-back exhaust followed by Fast Intention high flow cats (HFCs) or ART pipes! Then you can save your $$ for a Osiris tune...Gary

Last edited by gary c; 08-11-2017 at 08:55 AM.
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Old 08-11-2017, 12:32 PM
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Thanks Gary, that was very helpful. Now I can start planning my next three mods.
- Brad
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Old 08-12-2017, 10:20 PM
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You've already got a plenum spacer, don't need the manifold. its an either or type of thing. Also the MREV doesn't do much for the non rev up DE's (your motor). I would do exhaust and a tune then call it good for go fast stuff.
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Old 08-13-2017, 06:32 PM
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Just ordered my Fast Intention resonated HFCs. Next I'll probably go with an HKS cat-back exhaust to compliment them. Also, what type of gains could I expect from a set of Stillen Grounding wires? I appreciate the great feedback, it has been a huge help. Thanks again,
- Brad
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Old 08-13-2017, 07:10 PM
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Originally Posted by brads350gt View Post
Just ordered my Fast Intention resonated HFCs. Next I'll probably go with an HKS cat-back exhaust to compliment them. Also, what type of gains could I expect from a set of Stillen Grounding wires? I appreciate the great feedback, it has been a huge help. Thanks again,
- Brad
Brad, grounding wires allow your AT to shift smoother, that's about the only result you can really feel! Rather than getting them from Stillen and having to install wires you don't need give Sean (SXEXCX) a PM. He has the quality wires you need, the cost is reasonable!
Gary
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