Exhaust Diffuser Installation
PN-77015
BORLA® Performance Industries is proud to offer a truly unique product to the
aftermarket Cat-Back™ industry we started over 30-years ago. Inspired by motorsports aerodynamics, BORLA® Performance now offers racecar-styling for your
BORLA® equipped street car. The BORLA® Exhaust Diffuser is both an aesthetic
and functional component adding a subtle, track-inspired look to your vehicle while
decreasing turbulence below your BORLA® exhaust at highway speeds.
This BORLA® Exhaust Diffuser is not an afterthought product. It is styled to compliment your vehicle aesthetics, incorporating visual contours and multiple-fin elements for a subtle race-inspired look. This BORLA® Exhaust Diffuser is developed
concurrently with BORLA® products for proper static and dynamic thermal ventilation, adequate vehicle ground clearance, and combined system weight savings over
your factory exhaust system.
These instructions have been written to help you with the installation of your Borla Performance Exhaust System. Please
read this document completely before beginning the installation of your system.
Please compare the parts in the box with the bill of materials provided to assure that you have all the parts necessary for
this installation.
Thank you for purchasing a Borla Performance Exhaust Accessory.
Borla Performance Exhaust Diffuser (PN-77015) is designed specifically to attach to Borla Performance Exhaust Systems for the Chevrolet Corvette C7 Stingray,V8 engine RWD, Manual or Automatic Transmissions.
Borla Performance Exhaust Diffuser (PN-77015) is not designed to fit the OE exhaust system.
Borla Performance Industries recommends that an exhaust shop or professional after market parts installer perform the installation
of this system. However, if you decide to perform the installation on your own it is recommended that two people are used. This
installation should not be performed by one person due to the risk of injury. Ensure the installers use all under car safety precautions including eye protection.
Please take time to read and understand the following…
By installing your Borla Performance Exhaust System, you indicate that you have read this document and you agree with the terms
stated below.
It is the responsibility of the purchaser to follow all installation instruction guidelines and safety procedures supplied wi th your
Borla Performance Exhaust System
Borla Performance Industries assumes no responsibility for damages occurring from misuse, abuse, improper installation, impro per operation, lack of responsible care, or all previously stated reasons resulting from incompatibility with other manufactur er’s
products and/or systems.
TITLE: C7 Stingray Exhaust Diffuser
Installation Instructions
NOTE: Borla recommends using a liquid thread-lock to all hardware bolts to minimize bolts becoming loose. Inspect hardware periodically to prevent loose hardware that could lead to damage, M6 bolt torque value: 14-16 ft. lbs.
Minimum Required Tool List:
TOOLS:
1. 3/8” Drive Ratchet
2. 3/8” Drive 8” Extension
3. 10mm Deep Socket
4. 10mm Ratchet Box End Wrench
5. Protractor
SHOP SUPPLIES:
1 Spray Lubricant
Borla Performance - Bill of Materials
Diffuser Assembly material is lightweight aluminum with a durable powder-coat finish.
The Diffuser Assembly can be color-customized by the customer.
TITLE: C7 Stingray Exhaust Diffuser
Installation Instructions
Caution!!! Never work on a hot exhaust system. Serious injury in the form of burns can result If the vehicle has been in use and the exhaust system is hot, allow
vehicle to cool for at least 1 hour. Always wear eye protection when working under any vehicle.
Note: It is our recommendation that you use a hoist or hydraulic lift to facilitate the installation of your new Borla Performance System.
Taking all under car safety precautions, lift the vehicle using a hoist or hydraulic lift.
Note: Please compare the parts you have received with the bill of materials provided on the previous page to assure that you have all the parts necessary for the
installation of your new Borla Performance System.
NOTE: Borla recommends using a liquid thread-lock to all hardware bolts to minimize bolts becoming loose. Inspect hardware periodically to prevent loose hardware that could lead to damage, M6 bolt torque value: 14-16 ft. lbs.
Borla Performance Exhaust Diffuser Installation
1. Verify your Borla Rear-Section exhaust is properly installed before installation of your new Exhaust Diffuser.
2. Snap-in (4) Clip-On Nuts to FRONT and REAR Muffler Assembly Brackets (Assembly drawing). (See Figs. 1A & 1B)
Figure 1A
3. Install (2) L-Brackets to FRONT Muffler Assemblies with LONG SIDE parallel to ground with supplied hardware (Assembly drawing
for proper orientation). NOTE: LIGHTLY TIGHTEN BOLTS ALLOWING BRACKET TO SLIDE (See Fig. 2A)
4. Install (2) L-Brackets to REAR Muffler Assemblies with SHORT SIDE parallel to ground with supplied hardware (Assembly drawing
for proper orientation). NOTE: LIGHTLY TIGHTEN BOLTS ALLOWING BRACKET TO SLIDE (See Fig. 2B)
Figure 2A
Figure 1B
Figure 2B
Diffuser Assembly material is lightweight aluminum with a durable powder-coat finish.
The Diffuser Assembly can be color-customized by the customer.
TITLE: C7 Stingray Exhaust Diffuser
Installation Instructions
Rear Valence Rear Sub-frame
NOTE: Borla recommends using a liquid thread-lock to all hardware bolts to minimize bolts becoming loose. Inspect hardware periodically to prevent loose hardware that could lead to damage, M6 bolt torque value: 14-16 ft. lbs.
Borla Performance Exhaust Diffuser Installation (cont’d)
5. Snap-In (4) Clip-On Nuts to installed L-Brackets as shown (Assembly drawing for proper orientation). (See Figs. 3A & 3B)
Figure 3A
Rear Sub-frame
6. Carefully position Diffuser Assembly centering FRONT L-Brackets between upper and lower wings. (See Fig. 4A)
7. Slide Diffuser Assembly forward and gently bend REAR L-Brackets downward and insert then between upper and lower wings. (See
Fig. 4B)
Figure 4A
Figure 3B
Rear Valence
Figure 4B
8. Insert (4) Bolts & Washers through slots in Diffuser Assembly. NOTE: LIGHTLY TIGHTEN BOLTS ALLOWING EXHAUST
DIFFUSER ASSEMBLY TO SLIDE WITH U-NUTS.
9. Exhaust Diffuser Assembly should hang supported by hardware. Verify bolts are not too tight before continuing to align-
Figure 5
TITLE: C7 Stingray Exhaust Diffuser
Installation Instructions
ment step.
(See Fig.
Figure 6
6)
NOTE: Borla recommends using a liquid thread-lock to all hardware bolts to minimize bolts becoming loose. Inspect hardware periodically to prevent loose hardware that could lead to damage, M6 bolt torque value: 14-16 ft. lbs.
Borla Performance Exhaust Diffuser Installation (cont’d)
5. Beginning with Front L Brackets, position bracket approximately 1/4” from front edge. Lightly tighten corresponding front bolts to hold
front brackets in position. (See Figs. 7A & 7B).
Figure 7A
Position bracket 1/4” from edge
Figure 7B
6. Push Exhaust Diffuser Assembly forward creating a 3/4” gap to Left and Right sides from the OE rear valence as shown. Lightly tighten
corresponding front bolts to hold front brackets in position. (See Fig. 8)
Figure 8
/4” gap
3
Figure 9
10 degrees
7. Carefully position the strakes of the Diffuser Assembly no closer than 1/4” to the OE rear valence. Set the Diffuser Assembly angle 10-
degrees upwards towards the rear of vehicle. (See Fig. 9 and page 6 reference photos)
8. There may be variances in the installation of your exhaust system, vehicle hangars, etc. that will affect Diffuser Assembly alignment.
Tighten Front Bolts with 10mm ratchet box end-wrench and remaining (6) Bolts with a 10mm socket: 14-16 ft. lbs. (See Figs. 10 & 11)
Figure 10
TITLE: C7 Stingray Exhaust Diffuser
Installation Instructions
Figure 11
NOTE: Borla recommends using a liquid thread-lock to all hardware bolts to minimize bolts becoming loose. Inspect hardware periodically to prevent loose hardware that could lead to damage, M6 bolt torque value: 14-16 ft. lbs.
Installation Reference Photos
Side View
Custom Color Shown
Bottom View
Custom Color Shown
*** NOTES ******
Diffuser Assembly front edge (closest to axle) final height position is approximately 3/4” higher than back edge.
Perimeter ventilation gaps are designed for material thermal expansion and heat evacuation.
Diffuser Assembly material is lightweight aluminum with a durable powder-coat finish.
The Diffuser Assembly can be color-customized by the customer.
TITLE: C7 Stingray Exhaust Diffuser
Installation Instructions
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