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  See more parts for Subaru Forester XT
Select the year of your Subaru Forester XT:
GrimmSpeed 8mm Phenolic Thermal Manifold Spacer Subaru STI | WRX | Forester XT | Legacy GT | Outback XT 2004-2021 - 19001
GrimmSpeed 8mm Phenolic Thermal Manifold Spacer Subaru STI | WRX | Forester XT | Legacy GT | Outback XT 2004-2021 - 19001 - Image 2 GrimmSpeed 8mm Phenolic Thermal Manifold Spacer Subaru STI | WRX | Forester XT | Legacy GT | Outback XT 2004-2021 - 19001 - Image 2

Ever wondered what your intake manifold is sitting on? That’s right, it’s resting on a superheated boxer engine. If you’re in the know, you understand that cooler intake air means more horsepower for your ride. That’s where the GrimmSpeed Phenolic Intake Manifold/TGV to Engine Thermal Spacer comes into play.

This isn’t just some gimmick; phenolic spacers have been a go-to for specialized automotive brands for years, but for Subaru enthusiasts, this tech is a game-changer. Let’s break it down:

  • First off, these spacers do a fantastic job of cutting down heat transfer from your engine to the intake manifold, which means less heat soak. That’s crucial for keeping your performance up.
  • We’re talking about true phenolic material here—not that cheap cutting board stuff you might find elsewhere. This is the real deal.
  • With cooler intake temperatures, you’re looking at denser air, which translates to more power. For every 5-degree drop in air temp, you can expect about a 1% power increase. That adds up!
  • When you mix cooler, denser air with fuel, you boost your engine's efficiency. It’s a win-win.
  • Installation? It’s a direct bolt-on. You can get this done without a hassle.
  • Here’s a fun fact: when you’re just using a gasket, that intake manifold can get scorching hot—enough to burn your hand. But with the GrimmSpeed spacers and gaskets, you can touch it without any worries.
  • We recommend using two sets of our gaskets—one on each side of the spacers—for the best results.
  • And yes, all of this is proudly made in the USA.

How does it work? The air in your engine flows from the airbox to the turbo and then into the aluminum intake manifold. As it travels through, it picks up heat from the manifold, which can really mess with air density and ultimately your engine’s power. In stock form, that steel gasket between the manifold and engine allows heat to transfer quickly, but swapping it out for the GrimmSpeed Phenolic Spacer changes the game. These spacers can handle over 500°F, while Subaru engines typically run around 200°F, so you’re well within safe limits. Plus, GrimmSpeed has tested these spacers with race fuel, E85, and methanol—no issues there.

In fact, the Phenolic Spacer conducts 300-900 times less heat than the OEM steel gasket. That’s a serious upgrade!

Testing? We kept it real with testing at half-hour intervals on a consistent day. Here’s what we found:

  • OEM measurement from the intake manifold without spacers: 152°F.
  • With 3mm phenolic spacers, the temp dropped to 134°F.
  • And with 8mm phenolic spacers? We hit an impressive 108°F! That’s over a 44-degree drop with the largest spacers!

Fitment: This spacer is compatible with:

  • Subaru WRX 2012-2014
  • Subaru STI 2004-2021
  • Subaru Forester XT 2004-2013
  • Subaru Legacy GT 2005-2009
  • Subaru Outback XT 2005-2009

So if you’re looking to keep things cooler under the hood and boost your Subaru’s performance, the GrimmSpeed Phenolic Thermal Manifold Spacer is a solid choice. It’s all about those little upgrades that make a big difference in the long run.

Other Part Numbers:
GrimmSpeed #GRM019001

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle
2004-2008
 Subaru Forester XT
2005-2009
 Subaru Legacy
2005-2009
 Subaru Outback
2004-2021
 Subaru STI
2002-2014
 Subaru WRX

GrimmSpeed Banner

Who is Grimmspeed?

Grimmspeed is an automotive aftermarket company that was founded in 2006 by Justin Grimm. They specialize in creating parts for the exhaust system for various automotive vehicles. Grimm has always had this passion for cars and had always wanted to improve his vehicle’s performance. After numerous trials, he was able to perfect his craft and later on decided to turn it into his career. Today, they have become one of the leading brands when it comes to producing high-performance exhaust systems.

Expanding their Product Offering

The company initially manufactured parts for Subaru. But as the company expanded, they started offering parts for other brands such as Ford, Mitsubishi, Hyundai, and Mazda. They now offer parts such as intercoolers, intake, exhaust, engine pulleys, gaskets, boost controllers, phenolic spacers and so much more.

Continuous Product Development

Grimmspeed never stops in finding ways to produce innovative products and is always on the push to keep their products up to date. With the rapid change in automotive technology, it is a must that their product is able to adapt to this change for it to satisfy the demand of its users. This is the reason why the company has gained the trust of many tuners all around.

Purchase Grimmspeed Product at Vivid Racing

Built by an enthusiast for fellow enthusiasts.

If you want a product that is designed to improve the performance of your vehicle, then Grimmspeed is the brand for you. To know more about Grimmspeed, visit Vivid Racing and check out their list of products that would fit your specific needs.






 




What is the GrimmSpeed Limited Lifetime Warranty Policy?GrimmSpeed-branded products are warrantied to the original owner against manufacturing defects in materials and workmanship for the lifetime of the product.

If a GrimmSpeed-branded product covered by this warranty fails due to a manufacturing defect we will repair the product, without charge, or replace it, at our discretion. Only original, unaltered and unmodified materials and workmanship are covered by this policy and you must provide proof of original purchase to be fully covered. This warranty does not cover damage caused by accidents, improper care/installation, negligence, reasonable/normal wear and tear, or the natural breakdown of colors, coatings and materials over extended time and usage. GrimmSpeed cannot be held liable for any damage to your vehicle and/or its components caused by failures associated with the previous statement. Damage not covered under warranty may be considered for repair for a reasonable rate or a reduced price for a replacement piece (a fee will be charged for return shipping).This warranty is available in the United States and Canada.

This warranty does not cover products sold by GrimmSpeed that are not GrimmSpeed-branded products.

This warranty gives you specific legal rights; you may have other rights, which vary from state to state.

The GrimmSpeed website sells GrimmSpeed-branded discontinued, special make-up, and slightly blemished products at significant discounts as 'factory seconds' products. This warranty does not necessarily cover any products purchased as 'factory seconds'. The GrimmSpeed Warranty Department may repair 'factory seconds' products for a reasonable charge and a fee will be charged for return shipping.

Is normal wear and tear covered?

The GrimmSpeed Limited Lifetime Warranty covers manufacturing defects in materials and workmanship, but it does not cover normal wear and tear over extended time and usage. Wear and tear is damage that naturally and inevitably occurs as a result of normal use. Regardless of how carefully you use, or how well you care for your GrimmSpeed product, like all performance parts it will eventually begin to show age and wear. Common examples of wear and tear that would not be covered under the limited lifetime warranty include denting, abrasions or scratches, color changing from heat in exhaust components and so on, less common examples include flex-section wear and fatigue cracks over an extended period of time.

How do I send my product in for warranty?

The first step is to contact [email protected] and let them know of your issues/concerns. From there, a customer service representative will personally work with you to determine the best path forward. For the quickest service, please include your contact information and photos of the failed product along with a copy of your receipt/invoice in your initial email.

Upon request from your customer service representative, your product must be returned directly to The GrimmSpeed Warranty Department at 650 Taft St NE, Suite 300, Minneapolis, MN, 55413. All shipping to Warranty must be pre-paid and insured. GrimmSpeed cannot be liable for lost in-bound packages.

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