STM WRX/STi 2015-2020 Cat-Back Exhaust
The STM Stainless Steel Cat-Back Dual Exit Exhaust for the 2015+ WRX and STi will bolt up to your stock or aftermarket downpipe and gives you everything you want out of a catback exhaust! Full stainless steel construction, gorgeous design and hand-fabricated in the USA. The STM Exhaust utilizes your existing exhaust hangers and includes all gaskets and hardware for a clean and easy installation.
Vehicle Fitment:
2015-2020 Subaru WRX
2015-2020 Subaru STi
Install Notes:
We include 5 gaskets for this 4 gasket install.
• (1) 3" and M10 hardware for the center pipe to axle back
• (2) 2.5" and M10 hardware for the axle back to tips
• For the cat-back to stock downpipe use the 2.5" gasket and M8 hardware
• For the cat-back to 3" aftermarket downpipe use the 3" gasket and M10 hardware
Features & Specs
• Weighs 31.3 Pounds (Including Hardware & Gaskets)
• Factory Cat-Back Weighs 38 Pounds
• 6.7 Pounds Lighter Than Stock
• Tig Welded
• Back Purged
• 3" Piping to The Y
• 2.5" Piping From The Y to The Tips
• Mandrel Bent
• Full Stainless Steel
• Tig Welded
• Back Purged
• Gaskets & Hardware Included
• Bolts to Factory Locations
• Polished Blue Tips
• Beautiful Fit and Finish
Made in the USA!
Lifetime Warranty on STM Parts to the original purchaser against manufacturing defects.
Includes:
(1) STM Stainless Exhaust (4 Piece)
(2) 3" Remflex Gaskets
(3) 2.5" Remflex Gaskets
(8) M10 x 35 Bolts
(8) M10 Nuts
(2) M8 x 30 Bolts
(2) M8 Nuts
Shipping Times: 4-6 Weeks
Hand crafted and welded in New York, please give our fabricators time to assemble your piece!
Vehicle Fitment:
2015-2020 Subaru WRX
2015-2020 Subaru STi
Install Notes:
We include 5 gaskets for this 4 gasket install.
• (1) 3" and M10 hardware for the center pipe to axle back
• (2) 2.5" and M10 hardware for the axle back to tips
• For the cat-back to stock downpipe use the 2.5" gasket and M8 hardware
• For the cat-back to 3" aftermarket downpipe use the 3" gasket and M10 hardware
Features & Specs
• Weighs 31.3 Pounds (Including Hardware & Gaskets)
• Factory Cat-Back Weighs 38 Pounds
• 6.7 Pounds Lighter Than Stock
• Tig Welded
• Back Purged
• 3" Piping to The Y
• 2.5" Piping From The Y to The Tips
• Mandrel Bent
• Full Stainless Steel
• Tig Welded
• Back Purged
• Gaskets & Hardware Included
• Bolts to Factory Locations
• Polished Blue Tips
• Beautiful Fit and Finish
Made in the USA!
Lifetime Warranty on STM Parts to the original purchaser against manufacturing defects.
Includes:
(1) STM Stainless Exhaust (4 Piece)
(2) 3" Remflex Gaskets
(3) 2.5" Remflex Gaskets
(8) M10 x 35 Bolts
(8) M10 Nuts
(2) M8 x 30 Bolts
(2) M8 Nuts
Shipping Times: 4-6 Weeks
Hand crafted and welded in New York, please give our fabricators time to assemble your piece!
See more STM Products
Customer Reviews
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I recently installed the STM Tuned cat-back exhaust on my 2020 WRX, and I’m thoroughly impressed. The sound is truly exhilarating—when you get on it, the exhaust roars to life with a deep, aggressive note that perfectly complements the WRX’s sporty character. It definitely turns heads!
What I love most is the balance it strikes; at lower RPMs and cruising speeds, it remains pleasantly quiet, making daily driving a breeze. There’s no drone, so it’s comfortable on long trips. Overall, this exhaust has transformed my WRX’s personality, delivering a thrilling sound experience without sacrificing drivability. Highly recommend it for anyone looking to enhance their ride!
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