Pay in installments of $25.49 with
,
and
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Oct 9 - Oct 14
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
Flowmonster Performance Muffler 3 in Dual inlet & outlet 12599-FM 409 StainlessOverview The Flowmonster series of absorption style mufflers deliver a moderate tone for the enthusiast looking for a deeper, more aggressive exhaust note than most OE (Original Equipment) mufflers, unlike the racey exhaust note associated with "chambered" style mufflers. Interior construction features 3. 50 inch "straight through" perforated 409 stainless steel tube surrounded by high temperature sound absorption packing material which helps to
Overview
The Flowmonster series of absorption style mufflers deliver a moderate tone for the enthusiast looking for a deeper, more aggressive exhaust note than most OE (Original Equipment) mufflers, unlike the racey exhaust note associated with "chambered" style mufflers.
Interior construction features 3.50 inch "straight-through" perforated 409 stainless steel tube surrounded by high-temperature sound absorption packing material which helps to deliver a deeper, mellower exhaust note. The internal design is reversible allowing the flexibility to be installed in either direction to best accommodate fitment with the intended vehicle. The fully MIG-welded 409 Stainless Steel material is embossed with the "FLOWMONSTER" logo on the case.
Interior construction features 3.50 inch "straight-through" perforated 409 stainless steel tube surrounded by high-temperature sound absorption packing material which helps to deliver a deeper, mellower exhaust note. The internal design is reversible allowing the flexibility to be installed in either direction to best accommodate fitment with the intended vehicle. The fully MIG-welded 409 Stainless Steel material is embossed with the "FLOWMONSTER" logo on the case.
Features:
- 409 Stainless Steel construction for superior corrosion resistance and good looks
- Interior construction features high-temp interior sound absorption material delivering a deeper, mellow exhaust tone
- Perforated High-Flow straight-through tube design for increased exhaust flow
- Moderate increase in interior tone over most OE mufflers
- A stainless steel performance muffler at an economical price
- Internal Design is reversible allowing flexibility to be installed in either direction
- Sold Individually
- This is a Universal Fit muffler - Not a Direct fit. Some adaption may be required for proper fitment on some applications
| Body Height (in) | 5 |
| Body Length (in) | 22 |
| Body Width (in) | 11 |
| Finish | Natural |
| Fitment | Universal |
| Inlet Connection Type | Pipe Connection |
| Inlet Inner Diameter (in) | 3 |
| Inlet Outer Diameter (in) | 3.13 |
| Inlet Position | Dual |
| Material | 409 Stainless Steel |
| Muffler Series | Flowmonster |
| Muffler Type | Absorption / Glasspack |
| Outlet Connection Type | Pipe Connection |
| Outlet Inner Diameter (in) | 3 |
| Outlet Outer Diameter (in) | 3.13 |
| Outlet Position | Dual |
| Overall Length (in) | 28 |
| Reversible | Yes |
| Shape | Oval |
| Sound Level | Moderate Sound |
| Type of Muffler | Absorption |
| Part Number | 12599-FM |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 12 reviews
Sort
Product Reviews
★★★★★ 5
pretty good watch
Color: Silver
Cheap but pretty tuff. No it isn't my old tried and true Timex but is does wear well and servives even at work. I pack a lot of material in my hands all day and no watch goes without scratching but this watch has taken it so far. No time loss and the date stays curent so no complaints from me about it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 26, 2026
★★★★★ 5
Nice for the price
Color: Silver
Got it as a gift for my nephew and it fit his small wrist he loved it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 2, 2026
★★★★★ 4
Don't care for those type of bad but it works OK
Color: Silver
Well worth the cost
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 14, 2026
★★★★★ 5
It is easy to navigate from mode to mode.
Color: Silver
I have only had this watch for four month. So far I am satisfied with its performance.
One thing I like about it is that it only has three buttons. This makes it easier to manipulate. With only three buttons I have no problem remembering how to navigate from Mode to Mode.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 15, 2025
★★★★★ 3
Works and looks good but….
Color: Silver
My son liked this watch but it was a bit difficult to adjust the links other than that it works and looks good
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 30, 2025
recommand products
Grey Pneumatic 1018MSD 3/8" Drive X 18mm Semi-Deep
10.35
Grey Pneumatic 1030UD 3/8" Drive X 15/16" Deep Universal
45.04
xTune Chevy C10 88-98 LED Bumper Lights Chrome CPL-CCK94-LED-C - 5017352
82.00
ARP Hyundai 2.0L G4KF Turbo Flywheel Bolt Kit - 128-2801
50.65
Weapon R 02-06 Acura RSX Type S ONLY Secret Weapon Intake - 301-141-101
176.39