On orders over $100
100% Money Back on Select Parts
Product images
Product Media
GrimmSpeed Phenolic Thermal Spacer 8mm (Part Number: )
GrimmSpeed Phenolic Thermal Spacer 8mm (Part Number: )
GrimmSpeed Phenolic Thermal Spacer 8mm (Part Number: )
GrimmSpeed Phenolic Thermal Spacer 8mm (Part Number: )
GrimmSpeed Phenolic Thermal Spacer 8mm
Subaru N/A Models (inc. 1999-2008 Impreza / 2000-2006 Legacy)
Read 3 Reviews | 3 Q&As
Part # 017001

In stock! Ships same day

Features & Product Details

Do you know what your intake manifold sits on?...a superheated boxer engine. If you don't know already, the cooler your intake air is the more HP your car will achieve. GrimmSpeed has presented you the answer to this age old problem, raising the intake manifold off the engine with their new real Phenolic Intake Manifold/TGV to Engine Thermal Spacer.

Phenolic spacers have been used for years by many other specialized automotive companies, but this is very new technology to the Subaru world.

What it does:
* Greatly reduces the transfer of heat from engine to intake manifold thus reducing heat soak.
* One of a kind true Phenolic material, not cutting board material like others.
* The cooler your intake temperature is the denser the air is which leads to more power
* For every 5 degree reduction in temperature, increases power by 1%.
* The cooler and denser the intake air that the engine sucks in, increases the amount of air that can be mixed with fuel thus increasing efficiency.
* Direct bolt-on.
* When running the oem gasket only, your intake manifold gets very hot to the touch, enough to burn your hand. When the oem gasket is replaced with GrimmSpeed's Phenolic Spacer, your hand can be placed on the intake manifold without any issues.
* GrimmSpeed has installed both with and without OEM Subaru Gaskets and have had no issues with either way. They do recommend using 2 sets of oem gaskets however, one on both sides of the spacer.
* USA made

Package Contents:
1 Pair Phenolic Thermal Spacers
8 Longer bolts with washers


Brand: GrimmSpeed
Installation Hardware Included: Yes
Material: Composite
Thickness: 8.0mm
Mfgr. Warranty: Lifetime
Condition: New Product
Return Policy:

RallySport Guarantee - 30 Days

Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.



3 Reviews
5 out of 5 Stars
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Customer Photos and Videos
No user media. You can upload a photo or video of your install by posting a review.
New Parts 4 years ago
5out of 5stars

I have not installed the product to put a review on it, but I can say that the waiting period is always outstanding in comparison to other vendors.
Was this review helpful?
Improvment in low end most significant 5 years ago
5out of 5stars

Installed on EJ251 & 3 - A+ product, just a butt dyno but both my son & I feel bottom end improved throttle response below 3k rpm. We both have header, intake & pulley. There are not many bolt on upgrades for the NA but I'd say here's one that's worth it.
Was this review helpful?
threw this in with a cheep cold air intake 6 years ago
5out of 5stars

wicked product combined with a ebay ghetto cold air intake and pulled a extra 30Hp... let the beast breath oh yeah got more stickers to 5HP per sticker lol
Was this review helpful?


  • Q: Compatible with the 09 2.5i Impreza?  joshuamnr6 years ago

    Will this work with the 09 2.5i Impreza? My understanding is the 08 and 09 are very similar?
  • Q: Compatible  StiRaV27 years ago

    Are these compatible with older models? 1995 STI Ra V2 JDM? GC8 chassy code?
    • 0 of 0 people found the following answer helpful

      A:  We're not entirely familiar with those motors. For the best answer i would email us a picture of your head profile or intake manifold gasket to [email protected] From there we should be able to tell you if they will work! Mike

      Was this answer helpful?
    • 0 of 0 people found the following answer helpful

      A:  We are unable to confirm fitment with non-USDM vehicles because Grimmspeed does not test them on JDM models.

      Zach G. @ RallySport Direct 7 years ago  
      Was this answer helpful?
  • Q: 07 Install  Mustardman7 years ago

    I read that install on 05+ n/a Impreza's is not direct bolt on. Apparently the 8mm spacers prevents the EGR tube from being able to connect properly. Can you confirm this at all?
    • 0 of 0 people found the following answer helpful

      A:  That is correct. With any Subaru that has EGR you will need to remove or modify the EGR tube that connects the head to the EGR valve.

      Zach G. @ RallySport Direct 7 years ago  
      Was this answer helpful?

This Part Fits