Part #: BXEX - 51104. BLOX Racing's muffler delete offers a great upgrade. It replaces the OEM muffler from the axle - back, getting rid of the extra weight from heavy stock mufflers. Made from T304 stainless steel, with mandrel - bent and TIG - welded construction. Each delete kit has a dual - exit design and features polished single - wall quad exhaust tips.
APPLICATIONS:
- 2015 - 2021 Subaru WRX
- 2015 - 2021 Subaru STi (non SPT)
SPECIFICATIONS:
- 3” piping
- 3.5' tips
- T304 stainless steel
- Mandrel - bent tubing; TIG - welded
FEATURES:
- Dual muffler delete design with quad tips
- Single wall construction in standard finish
- Direct bolt - on
- Comes with new hardware and gaskets
BENEFITS:
- Replaces heavy and bulky OEM mufflers
- Gives an aggressive look
- Produces throaty exhaust notes and tones
NOTES:
- Bolts to 2 - hole exhaust flange
- Won't work with aftermarket exhaust systems
- Doesn't fit SPT exhaust

Using this BLOX Racing Axle Back Exhaust is easy. First, make sure your car is a 2015 - 2021 Subaru WRX or a 2015 - 2021 Subaru STi (non SPT). It's a direct bolt - on, so you can simply replace the OEM muffler with this one using the new hardware and gaskets included. When installing, ensure it bolts to the 2 - hole exhaust flange. Remember, it won't work with aftermarket exhaust systems or SPT exhaust.
For maintenance, since it's made of T304 stainless steel, it's quite durable. But it's a good idea to check the welds and hardware regularly, especially after long drives or rough roads. If you notice any signs of damage or loose parts, get them fixed right away. Keep it clean by washing it with mild soap and water to maintain its polished look and performance.