

🚗 Elevate your exhaust game with Borla’s ProXS – where power meets precision.
The BORLA 40363 ProXS Muffler features a durable T-304 stainless steel construction with a reversible 2.25" center inlet/outlet design. Its 4" x 9.5" oval body and 19" overall length provide a universal fit for trucks, ensuring easy installation and enhanced exhaust flow. Made in the USA, this muffler delivers reliable performance and the iconic Borla sound.
| Brand | Borla | 
| Vehicle Service Type | Truck | 
| Configuration | Center/Center | 
| Shape | Oval | 
| UPC | 808422403634 | 
| Manufacturer | BORLA | 
| Global Trade Identification Number | 00808422403634 | 
| OEM Part Number | 40363 | 
| Model | Borla 40363 | 
| Item Weight | 8.55 pounds | 
| Item model number | 40363 | 
| Is Discontinued By Manufacturer | Yes | 
| Exterior | Painted | 
| Manufacturer Part Number | 40363 | 
G**R
1991 jeep YJ w/ 4.0L i6. Great results
High build quality, thick walled SS, sounds incredible. It is a slight noise increase from stock, but much more pronounced "rolling" sound. 1991 jeep YJ
O**R
Nicely priced muffler
Good muffler, great brand, even better price. Only drawback is some minor imperfections on some of the seamweld, nothing to compromise it structurally.
C**O
Excelente
Excelente
D**N
Love the sound although it's a little loud in the ...
Love the sound although it's a little loud in the cab of my 99 Tacoma. But It has it a much deeper sound than the muffler I had on it.
C**B
Gave my car (7th gen Celica) a very nice performance sound
Gave my car (7th gen Celica) a very nice performance sound, way better than the stock exhaust. Produces a nice deep rumble to where it is noticeable but it is not obnoxious. Good work, Borla!
D**.
Not the deep sound I expected, 98 Toyota 4runner ...
Not the deep sound I expected, 98 Toyota 4runner 3.4. Have flowmaster on my 3.0 and sounds much more throaty and not tinny
T**E
Borla + Resonator Delete = Epic
This muffler plus a resonator delete sounds awesome on my 2000 Miata. It's just loud enough and pops when shifting.
D**E
It's a Borla
Always love Borla
Trustpilot
2 weeks ago
3 weeks ago