VA WRX/STI Rear Under Spoiler With Chassis Mounts & Rear Extension

 10 weekly payments of $35.90 learn more

Australian delivery: 1-7 days | International delivery: 7-10 days
Pickup: we will notify you once your item is ready for collection.

After your order is confirmed, it is hand finished, polished & inspected to ensure you receive the highest quality.


Receive a FREE Tarmac Works 1/64 Subaru WRX STI diecast model car valued at $34.00 with all VA WRX purchases over $600AUD!

While stocks last - please write "WRX Diecast" in the order instructions during checkout and we'll ship it with your order if they're still available!

Suits 2014-Present VA WRX & VA WRX STI

10 year warranty ON REAR VALANCE & Chassis Mounts included

LIMITED TIME: Rear Extension is included for FREE

Click here for Subaru VA WRX/STI Rear Diffuser


Our Rear Under Spoiler includes chassis mounts which are hardened steel mounts that bolt directly onto the metal OEM VA WRX/STI rear without having the need to drill any additional holes, giving our under spoiler improved strength and stability.

The suspended spoiler can then be easily installed and adjusted on the car by up from 0mm-20mm. This design gives you the flexibility to run the spoiler conservatively or more aggressively, with a simple 4mm Allen key wrench. Adjustments can be done in just a few minutes when installed on the car.

Full movement can be seen in the video above. Once the desired position is set, tighten and you're ready to go. Chassis mounts are included with the rear diffuser kit to guarantee secure fitment!

Subaru VA WRX/STI Rear Under Spoiler Kit Includes:

  • Subaru VA WRX/STI rear valance
  • Subaru VA WRX/STI rear valance chassis mounts (pair)
  • Subaru VA WRX/STI center support bracket
  • BONUS: Subaru VA WRX/STI rear under spoiler extension
  • x2 Flow Designs stickers
  • Fitting kit

Subaru VA WRX/STI Rear Under Spoiler Material & Finish:

  • Valance: 10mm thick polyethylene composite, bevelled edges
  • Rear Under Spoiler Extension: 4.5mm thick textured ABS 
  • Valance: Hand polished satin black
  • Rear Under Spoiler Extension: scratch resistant textured ABS plastic
  • CNC engraved logo and features


Why do you use polyethylene composite for your products?

Strong, impact-resistant, doesn't corrode or chip, and has excellent abrasion resistance (eg. scraping on driveways!)

What about carbon fibre?

As strong and light as carbon fibre is, it cracks on impact or when under load and/or stress. Clearcoat will eventually fade or crack, becoming undesirable.

Tell me about ABS plastic!

Please note that although all our precision-made ABS accessories are extremely strong and durable, they do not hold the same shatterproof label as our 10mm thick polyethylene composite splitters. The accessories are manufactured in ABS with the intention that they will be lighter, bolt-on attachments that will improve aesthetics and are easily replaceable if they become damaged from varying road conditions.

Install Instructions Page 1 (PDF)

Install Instructions Page 2 (PDF)

How Strong Are Our Splitters?


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