Problem 2 on Design of Bolts Video Lecture from Design of Bolted Joints Chapter of Design of Machine Subject for Mechanical Engineering Students.
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• Direct fit for the 2015+ Subaru WRX and STI
• Extremely aggressive turbo and exhaust tone under acceleration and boost
• Designed with oval mufflers to prevent highway drone
• Installs in under an hour
• Quad 3.5″ staggered double-wall polished tips
• Full 304 stainless steel mandrel-bent construction
• Dyno-proven maximum gains of up to 9 whp and 8 wtq and peak gains of up to 4 whp and 3 wtq, using 93 octane fuel while maintaining safe AFRs on the stock tune (2015 WRX with CVT)
• TIG-welded to perfection
• 3″ to 2.25″ exhaust split helps maintain proper exhaust velocity
• Mates with Mishimoto, stock, or most aftermarket downpipes
• Made in the USA
• Mishimoto Lifetime Warranty
Model: MMEXH-WRX-15
Learn how to install your new 2015+ WRX and STI Cat-Back Exhaust!
Installation Guide:
Parts List
(1) Stainless Steel Midpipe w/ 2-bolt flange
(1) Stainless Steel Midpipe to Y section
(2) Staineless Steel Mufflers w/ quad 3.5″ staggered double-wall tips, polished
(2) 2.25″ v-band clamps
(1) 3″ exhaust band clamp
(1) 2-bolt flange gasket
(2) 3/8″ – 16 serrated flange hex nuts, stainless steel
(2) M10 washers, stainless steel
Mishimoto Lifetime Warranty
Tools Needed
12mm Ratchet Wrench
14mm Wrench
11mm Deep Socket
14mm Deep Socket
3/8″ Short Extension
3/8″ Drive Ratchet
Pry Bar
Silver Anti-Seize Lubricant
WD-40
Disclaimer
• Raise vehicle only on jack stands or on a vehicle lift.
• Allow vehicle to cool completely prior to attempting installation.
• Do not run the engine or drive the vehicle while overheating, as
serious damage can occur.
• Please dispose of any liquids properly.
• Mishimoto is not responsible for any vehicle damage or
personal injury due to installation errors, misuse, or removal
of Mishimoto products.
• Mishimoto suggests that a trained professional install all
Mishimoto products.
INSTALLATION INSTRUCTIONS
1. Raise the vehicle off the floor.
2. Disconnect the mid-pipe from the downpipe by removing the
two 12mm nuts and two 14mm bolts. (12mm ratchet wrench,
14mm wrench)
3. Remove the stock donut gasket by gently prying away from
the flange.
4. Disconnect the five rubber bushings for the exhaust-hangers.
(Pry bar and WD-40)
5. Lower the stock exhaust system.
INSTALLING THE MISHIMOTO EXHAUST
(For installation with a stock downpipe, you will need to reuse
your stock donut gasket and purchase the Mishimoto Subaru
Exhaust Adapter, 3” Downpipe-to-Stock Exhaust, P/N: MMEXHADAP-3DSE.
The stock exhaust bolts cannot be used with the
Mishimoto exhaust.)
1. Apply anti-seize lubricant to the two 14mm mid-pipe bolts,
and then install the washers.
2. Install the mid-pipe exhaust gasket.
3. Install the mid-pipe and hand-tighten the two 14mm nuts and
bolts. Make sure that the mid-pipe is oriented in the same
direction as the stock exhaust.
4. Make sure that all five of the rubber bushings for the exhaust
hangers are properly in place, and then attach the two mufflers.
Spray the hangers with WD-40 to help them slide into place.
5. Install the band clamp exhaust onto the mid-pipe. Make sure
the hardware faces the driver side.
6. Spray the rubber exhaust hanger with WD-40 and attach to
the Y-pipe.
7. Mate the mid-pipe to the Y-pipe and hand-tighten the
band clamp.
8. Connect the mufflers and Y-pipe with the V-band clamps.
Apply anti-seize lubricant to the threads of the V-band clamps
prior to installing them onto the Y-pipe.
9. Push up on the mufflers to make sure that clearance is set
correctly between the exhaust tips and the rear bumper.
Make adjustments if needed.
10. Tighten the mid-pipe to Y-pipe band clamp. (14mm deep
socket, 14mm wrench)
11. Tighten the V-band clamps. (11mm deep socket)
12. Tighten the mid-pipe bolts that connect to the downpipe.
(14mm wrench, 12mm ratchet)
13. You’ve just installed your new 2015+ Subaru WRX/STI
Cat-Back Exhaust. Enjoy!
Mishimoto does not recommend installing this cat-back exhaust
and the Mishimoto WRX Performance Air Intake with the stock
ECU programming. It is recommended that the customer retune
the vehicle’s ECU after installing the cat-back exhaust and
Performance Air Intake. Power gains will vary depending on the
type of ECU tune that is applied to the vehicle.