STM Tuned WRX/STi 2015-2020 Axle-Back to Cat-Back Upgrade
Buy now pay later,no extra cost!
Payments from $182.87 with

"Allow 7-14 Days For Parts Manufacture/Order Processing Before Shipping"
If you already purchased the STM Axle-Back Exhaust, you can purchase the rest of the cat-back system separately for a full upgrade! This *should* also be compatible with many other aftermarket axle-backs that have a 2.5" flange and bolts to the stock locations, but please confirm before purchase.
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.
Features & Specifications:
- 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
- Beautiful Fit and Finish
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
Vehicle Fitment:
- 2015-2020 Subaru WRX
- 2015-2020 Subaru STi
STM Products are made in the USA!
Lifetime Warranty on STM Parts to the original purchaser against manufacturing defects.
Includes:
- (1) STM Stainless Exhaust (Mid and Y Pipes)
- (2) 3" Remflex Gaskets
- (2) 2.5" Remflex Gaskets
- (8) M10x35 Bolts
- (8) M10x1.5 Nuts
- (2) M8x30 Bolts
- (2) M8x1.25 Nuts