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Purchase GT4 Rear Lower Diffuser
  • GT4 Rear Lower Diffuser SKU: PKGT4DIFFUSER

  • MSRP $1,296.00 $995.00

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Product Details

Genuine Porsche GT4 Rear Lower Diffuser – 981 Cayman & Boxster Compatible with 2013–2016 Porsche 981 Boxster, Boxster S & Boxster GTS, and 2014–2016 Porsche 981 Cayman, Cayman S & Cayman GTS

One of our personal favorite upgrades for the 981 platform — and it's easy to see why. The Genuine Porsche GT4 Rear Lower Diffuser replaces the standard black plastic rear valance with the aggressive GT4 version, which extends further rearward and features an integrated mesh grille for a dramatically more purposeful and track-inspired lower rear appearance. A direct factory-correct upgrade that transforms the back end of your 981 in a way that turns heads at every car meet.

What's Included A complete Genuine Porsche GT4 rear lower diffuser and necessary heat shields. A direct fit for most models — some may require minor modifications.

Fitment & Compatibility

  • 2013–2016 Porsche 981 Boxster, Boxster S & Boxster GTS
  • 2014–2016 Porsche 981 Cayman, Cayman S & Cayman GTS
  • Not compatible with rear parking sensor equipped models — confirm your car's configuration before ordering
  • Some models may require minor modifications for proper fitment
  • Due to oversized packaging, freight shipping may be required — will be confirmed at time of order

Important — Please Read Before Ordering Not compatible with rear parking sensors — confirm your vehicle's configuration before ordering. Some models may require minor modifications during installation. Professional installation is recommended.

Warning: Cancer and Reproductive Harm - www.p65warnings.ca.gov
This warning is being provided to comply with the State of California's Proposition 65. Product description enhanced by AI to improve your experience.

5/5 Stars out of 8 Reviews
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Looks mean! ( Verified Buyer )
5 out of 5 stars.
Brett | August 31st, 2022
Although I don't race on the track... I want every add-on to help my car be all that it can be! This was an exceptional addition!
Excellent fit
5 out of 5 stars.
Jason (New Hampshire, USA) | July 18th, 2020
Removing the bumper definitely makes this easier to install. I was in the process of installing a rear camera at the same time, so it just made sense to do so. Adds a more aggressive look to the rear of the car and has me looking for a cost-effective solution to balance the look out on the front. I'm very surprised no one makes a gt4-esque urethane plastic front accessory for the base and S 981 models. There are plenty to be had for the GT4 and GTS, yet all I can find for the much more common models is in fiberglass or carbon fiber for $1000-1800! Yet the GT4 front piece is less than $300. It makes no sense to me. But I digress. This product is great, has a perfect factory fit, and I'd give it a difficulty level of 3/5 to install. Really enhances the look of the car and at around $500 it is a worthwhile add-on if you are going for a sportier look at a reasonable price.
Great Item
5 out of 5 stars.
Ernesto Sola (Puerto Rico) | April 4th, 2020
Excellent quality, perfect for a sunday DIY proyect. In love with the looks of the car, 100% recomended.
Looks very good; needs professional installation
5 out of 5 stars.
WAB (Boston) | November 19th, 2017
Unfortunately, my rear bumper was damaged by a smack from another driver, so I decided to upgrade.I already had my eye on the GT4 rear diffuser. Suncoast over-nighted the parts to me (the package was on-sale) and I had a body shop do the installation. There are multiple parts and heat shields, and the rear bumper cover has to come off. The end-result is a more aggressive and custom look, that complements other visual upgrades I have made to the car (new exhaust tips, tinted rear tail lights, clear side markers, sport mirrors, etc.)
Looks great. Painful to install
5 out of 5 stars.
James (CT) | July 11th, 2017
The GT4 rear diffuser certainly looks great on my Cayman S, but be prepared to spend some time removing the old one and installing the new. Patience is required, especially if you don't want to damage anything. Blue painters tape should be used to protect the bumper cover and several "tricks" are needed to free the old diffuser. Center section is the hardest and loosening the tailpipes and angling them down gives you some more room to see things.
Received and was very pleased!!
5 out of 5 stars.
Bill L | September 6th, 2016
Received and was very pleased!!
GT4 REAR DIFFUSER
5 out of 5 stars.
Thresholdman (Cincinnati) | June 23rd, 2016
I love my Cayman S but I didn't like seeing the oxidizing mufflers through the stock rear diffuser. The GT4 rear diffuser solved this problem and added a much more aggressive look. I had this installed by my dealer who took two hours for installation.
Great product
5 out of 5 stars.
Bill (Fort Payne, AL) | June 21st, 2016
I installed the GT4 Diffuser and was immediately impressed with its looks. I think it adds a much better look to the rear of my GTS.
 
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Warranty Coverage by Product Type

Genuine Porsche OEM Parts — 2-Year Warranty

All Genuine Porsche OEM parts purchased from Suncoast Porsche or SuncoastParts.com come with a 2-year, unlimited mileage, parts-only warranty beginning on the date of purchase.

If your parts are installed at an authorized Porsche Service Center, both parts and labor warranty coverage may apply if the part is deemed defective within the 2-year warranty period. Coverage varies by location — please check with your local Porsche dealer prior to installation to confirm their specific warranty participation, as each Porsche Center is independently owned and operated.

Important warranty notes for online purchases:

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How to Obtain Warranty Service

Installed by an Authorized Porsche Dealer

If your parts were originally installed by an authorized Porsche dealer, warranty repairs may be performed by that same dealer or any other authorized Porsche Service Center in the United States. Please allow a reasonable timeframe for repairs after delivering your vehicle to the dealership.

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