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5/16 plenum spacer or new intake manifold

Old Dec 15, 2008 | 04:17 PM
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Default 5/16 plenum spacer or new intake manifold

i have used the search button and this question might be common knowledge for all you Z veterans so yeah need some help

i have a 04 350z and im planning on getting a cosworth intake manifold...runs around 1200 bucks...my question is would getting a spacer do the same job?..would i get decent gains with the cosworth?could i put a spacer on the cosworth?

opinions would be much appreciated...
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Old Dec 15, 2008 | 04:22 PM
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unless you're turbo'd it's not even close to worth the money for you to get a cosworth.

spacer gives you awesome gains.
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Old Dec 15, 2008 | 04:29 PM
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yeah i am torn between that and a HKS Hi power exhaust...the wife is chippin in 500 bucks for christmas...other mods that i have are ACT clutch,flywheel and injen cold air..the cosworth and the exhaust are around the same price and i want to get the best part for my cash
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Old Dec 15, 2008 | 04:29 PM
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forgot about my signature...sorry bout the mod list..haha
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Old Dec 15, 2008 | 04:32 PM
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get the spacer...if you go FI then consider the cosworth.
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Old Dec 15, 2008 | 04:32 PM
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Get the Motordyne 3/8 or 1/2" spacer. . .cosworth is not worth the money and wait.

I have the cosworth on my 04 G right now and I'll be going back to the MD spacer next month.

The cosworth looks nice, sounds great but isn't worth it. The bracket on the right end cap broke off during driving. . .not really what you want on a $1200 piece. . .

I'll go take a pic right now





something that can be easily remedied but still. . .

Last edited by nismo240r; Dec 15, 2008 at 04:45 PM.
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Old Dec 15, 2008 | 04:35 PM
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yeah...spacer is so much cheaper too..would i feel a noticeable difference?
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Old Dec 15, 2008 | 04:40 PM
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Originally Posted by leg killa
yeah...spacer is so much cheaper too..would i feel a noticeable difference?

yep, both in performance and sound (hear the engines sexy growl). . .combine that with a z-tube and you're set

*edit* just saw your list of mods. ..

Last edited by nismo240r; Dec 15, 2008 at 04:42 PM.
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Old Dec 15, 2008 | 04:44 PM
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z tube..isnt that a rev up thing...z tube and a cone filter...i have a injen cai so wouldnt see the use to go back to stock
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Old Dec 15, 2008 | 04:46 PM
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Originally Posted by leg killa
z tube..isnt that a rev up thing...z tube and a cone filter...i have a injen cai so wouldnt see the use to go back to stock

lol yeah i didn't see that you were driving a z, i'm used to the G forums sorry. . .your factory intake tube is an upgrade to the G35 OEM piece. . .
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Old Dec 15, 2008 | 04:49 PM
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yeah funny causer a buddy of mine that owns a G wants to buy my stock Z tube...told him 60 bucks
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Old Dec 15, 2008 | 04:51 PM
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i noticed everyone getting the 5/16...would a 1/2 be better?more air is a better thing yeah?...i guess dudes just dont want to get rid of OEM strut bar?
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Old Dec 15, 2008 | 04:53 PM
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https://my350z.com/forum/intake-exha...rs-needed.html

you should do that. . .get the exhaust, y-pipe and spacer all in one!

a lot of people are getting the 3/8" because that's focused for more usable power across the board i.e. daily driver. . .

1/2 is more for higher rpm's. ..
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Old Dec 15, 2008 | 04:59 PM
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and the 5/16?
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Old Dec 15, 2008 | 05:21 PM
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If you drive a Z, I always recommend the 5/16" because it allows you to keep the strut bar.

The 1/2" spacer makes more top end gain but the 5/16" makes a better average gain.(and it lets you keep the stock strut bar.)

We used to make a 3/8" spacer a few years back but the 5/16" is a little better optimized.
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Old Dec 15, 2008 | 05:29 PM
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oops i meant the 5/16" spacer. . .
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Old Dec 15, 2008 | 05:45 PM
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most of the spacers are the same yeah...F1 makes a spacer..MD really popular
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Old Dec 15, 2008 | 06:50 PM
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Spacer for sure!. great gains!!..Tony and his customer service is outstanding!
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Old Dec 15, 2008 | 06:56 PM
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Originally Posted by leg killa
i have used the search button and this question might be common knowledge for all you Z veterans so yeah need some help

i have a 04 350z and im planning on getting a cosworth intake manifold...runs around 1200 bucks...my question is would getting a spacer do the same job?..would i get decent gains with the cosworth?could i put a spacer on the cosworth?

opinions would be much appreciated...
Plenum spacer for the money is a wiser choice....

Todd
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Old Mar 15, 2010 | 03:42 AM
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I just put the spacer in my car. I've noticed a huge difference. I finally got over 160, and I can tell by the pull off the line. Also, the car pulls a lot more, and it makes the exhaust sound a lot better!
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