VELOSSA TECH 2023+ GR Corolla BIG MOUTH Ram Air Intake

Product Information
Specifications

• Model: 2023+ GR Corolla BIG MOUTH Ram Air Intake
• Installation Time: 2 hours
• Tools Required: Basic hand tools

Product Usage Instructions
Base BIG MOUTH Kit Installation

1. Loosen stock components and reposition the Hella Horn if necessary.
2. Insert the BIG MOUTH at an angle while flexing the bumper to fit through.
3. Align the upper inlet with the grille opening and secure using provided screws, washers, and lock nut.

BIG MOUTH + High Flow Induction Kit Installation

1. Follow steps for base BIG MOUTH kit installation.
2. If applicable, install the Airbox Duct, Feed Duct, and Plenum as included in the kit.

Upgrade Kit Installation

1. Follow steps for base BIG MOUTH kit installation.
2. If applicable, install the Airbox Duct, Feed Duct, and Plenum as included in the kit.

FAQ (Frequently Asked Questions)
Q: Do I need to remove the stock intake for installation?
A: For the High Flow Induction kit, it is necessary to temporarily move the OEM airbox out of the way but full removal is not required.

2023+ GR Corolla BIG MOUTH Ram Air Intake Installation Guide

Kit Contents (Base BIG MOUTH Kit)

Please review this document before attempting installation.
You will need basic hand tools and 2 hours of installation time.

Kit Contents Qty

• M6 x 40mm cap screw 1
• 6mm large washer 2
• M6 lock nut 1

• 6 x 1/2″ screw 2

• BIG MOUTH 1
• Adapter 1

Kit Contents (BIG MOUTH + High Flow Induction Kit)

Please review this document before attempting installation.
You will need basic hand tools and 2 hours of installation time.

Kit Contents (Upgrade Kit)
Please review this document before attempting installation.
You will need basic hand tools and 2 hours of installation time.

If you are adding the High Flow Induction kit to your existing base kit, skip to slide 8.

Hella Horn Repositioning

For GR Corolla owners who own Hella Horns, there is no need to remove the horn for the BIG MOUTH to fit but it’s position will need adjusting. This adjustment can be done without bumper removal. Use the stock horn bracket and bolt to reposition the horn so that it sits 1.5” lower. Without repositioning of the Hella Horn, the snorkel cannot be properly installed. Complete this step prior to installation of the BIG MOUTH (if applicable).

Loosen Stock Components

While bumper removal will make for an easier install, full bumper removal is not required to install the BIG MOUTH.
Remove the plastic cover by undoing the retaining clips. At this point, all that is required is the removal of the stock snorkel and the loosening of all fastening points along the top of the bumper so that the top-center section of the bumper can flex forward.
As the top-center section of the bumper is being held forward, maneuver the BIG MOUTH into position by starting at the center near the hood latch, coming in at an angle and working it towards the driver side of the car.

Installing BIG MOUTH
Place the BIG MOUTH such that the upper inlet lines up with the flared opening in the grille. Line the fastening points up with their respective holes. Use the OEM clips that were used to retain the OEM snorkel along with the supplied M6 x 40mm cap screw, 2x 6mm washers and 1x M6 lock nut to secure the body. An extra-deep 10mm socket or socket extension will come in handy for this step.

Instruction Sets

For the next few steps, there will be varying instructions depending on whether you purchased the (1) BIG MOUTH kit or (2) BIG MOUTH plus High Flow Induction kit.

• For those who purchased the Base Kit (no High Flow Induction kit), follow the slides with the orange border
• For those who have purchased the High Flow Induction kit, follow the slides with the blue border
• For those who are upgrading to a High Flow Induction kit, undo what is shown in orange-bordered slides and follow the steps in blue-bordered slides

Installing BIG MOUTH: Adapter
If you ordered the BIG MOUTH without the High Flow Induction kit, you will have received an adapter that is meant to hook up to your OEM or aftermarket airbox. Install it by using the supplied #6 screws to fasten it to the main body. You will be threading into plastic so do not overtighten or you will damage the parts. Reinstall your OEM intake (if applicable). 

SXTH Intake Adjustment
For SXTH Element CPLT Intake owners
If needed, adjust the mounting bracket by loosening the two M4 screws, tilting to desired angle and tightening them in the proper position.

Remove Stock Components

To begin installing the High Flow Induction kit, it is necessary to remove the stock intake and temporarily move the OEM air box out of the way. Lift the airbox out of the rubber grommets that hold it in place while disconnecting the bare minimum in connectors and vacuum lines (if needed at all). Full removal of the air box is not necessary.

Installing BIG MOUTH: Plenum

To install the plenum, follow these instructions:

• Driver side: Remove the OEM hex bolt and use an M6 x 30mm cap screw with 1x 6mm washer to fasten. Do not fully tighten yet.
• Passenger side: Use an M6 x 30mm cap screw, 1x 6mm washer (bolt head side), 1x (1/4” by 1” fender washer [lock nut side]) and 1x M6 lock nut to fasten. Align the rearmost corner of the plenum with the edge of the frame it is sitting on. The orientation of the plenum will dictate where other elements of the kit will sit.
• Tighten both sides and place airbox on top of the plenum.

Installing BIG MOUTH
Insert the feed duct into the plenum opening until it bottoms out (with the raised letters [GRC] face down). Next, install the airbox duct by inserting the feed duct into the airbox duct’s lower opening and placing the airbox duct outlet over the airbox opening. If the parts are not lining up, adjust the angle at which the plenum sits.

Installing BIG MOUTH
Install the airbox duct to the BIG MOUTH by using the supplied #6 screws. Reuse the OEM clips that retained the OEM intake to fasten the airbox duct. You will be threading into plastic so do not overtighten or you will damage the parts

Finalizing BIG MOUTH Install

Ensure all the screws are tight and that the BIG MOUTH feels secure and free of interference before reinstalling stock components.

Final Assembly Review

Review the install and make sure nothing is binding or causing any preload on any parts, ensure that screws are tight and that your hood can close properly.

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