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Old 04-12-2013, 02:31 PM   #1
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Pros and cons Plenum/74mm Throttle body

Hi everyone,
I would like to install a IPD Plenum with a 74 mm throttle body on my 2003, 986 Bosxter 2,7L. and would like to hear from anyone experience with this add on performance.
thank you.
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Old 04-12-2013, 05:44 PM   #2
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I am in the process of doing mine, just gathering all the parts. I haven't heard of anyone complain of any negative outcomes, but would also like to know if anyone has. By the way save 800$ and just buy the 997 plenum.
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Old 04-12-2013, 06:03 PM   #3
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Ckrikos is correct. You can replicate whatever the IPD plenum has to offer by assembling the necessary 997 parts for a fraction of the cost. Also, many have opted to use a 76mm TB instead.
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Old 04-12-2013, 06:26 PM   #4
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I think they are all 76mm, just depends what you are measuring. I bought a 2003 c4s throttle body and it mates perfectly to the 997 v1 plenum.
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Old 04-13-2013, 04:56 AM   #5
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Here are some pic of what they are and the differences



The inside has a air divider that stops the dead space as the air hit the back of the plenum body. It also has a cross flo hole to help cavitation.



Diameter is much larger



End result depend on your exhaust, and other modifications. I've used this on a 2.7 base 2003 for 2 years with good results. The big picture is the total package require exhaust and ECU changes, that could net you a nice HP increase. Down side is a nearly equal cost
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2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust

Last edited by jsceash; 04-13-2013 at 05:05 AM. Reason: Add pics
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Old 04-15-2013, 03:30 PM   #6
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Hello,
Thank you gentlemen for your informations and pictures. I am going to pursue the 987 swap.
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