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FMF Factory 4.1 RCT Full Exhaust System
FMF Factory 4.1 RCT Full Exhaust System

$517.48 - $1034.98
10% Off - Save up to $57.50

Item #FMF00SU

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1 Review
5 out of 5 stars
5 Star   1 4 Star   0 3 Star   0 2 Star   0 1 Star   0
All Reviews
Mx928 Verified Purchaser
3 months 15 days ago Palmer, Alaska
Sounds awesome

Noticed a little power increase across the power band

9 Questions
Answered:   7
Not Yet:   2
Dustin Richards
Q: Do you have to replace the packing in this exhaust?
Over 5 months ago
DaveGearhead
Top 1
Over 5 months ago
A: Muffler packing should be replaced on hour use regiment. Usually one year of use is the time frame, but it could be more often depending on the use of the bike.
Cain
Q: Why are both mid pipes listed as standard? Is one the powerbomb and one the megabomb? If so which one is which?
Over 5 months ago
Trevor Gearhead
Top 10
Over 5 months ago
A: The megabomb has the larger expansion chamber. The RCT comes in a variety of configurations and we'd need to know the year make and model of your machine to identify what is offered.
lochy
Q: Whats the difference between the FMF Factory 4.1 RCT and the power parts and the KTM PowerParts FMF Factory 4.1 RCT Muffler
Over 5 months ago
Trevor Gearhead
Top 10
Over 5 months ago
A: They tend to be released earlier and are branded KTM. That's about it.
Scott
Q: I’m putting the system on a crf450x 2017. Will I need to change stock jets?
Over 6 months ago
Shawn dawg
Q: What is the best exhaust system to wake up my 2016 CRF 450 R. Mostly woods riding, looking for more low-end power
Over 7 months ago
Brady767
Q: Does the kit come with the gasket of any sort? For the mid pipe going into the slip on 
Over 7 months ago
CodyGearhead
Top 25
Over 7 months ago
A: No it does not. If your bike uses a gasket in stock form, you'll need to get an OEM gasket or reuse the old one.
James
Q: Is there a dyno read out comparison for a stock 2017 kx250f vs a 2017 kx250f with the complete titanium mega bomb exhaust?
Over 8 months ago
Paul
Top 10
Over 8 months ago
A: FMF is unable to provide the details you require. Outside of the exhaust, there are many other factors that well affect horsepower readings.
crashman008
Q: What’s better for the 2019 kx450, the powerbomb or megabomb header? i ride motocross/arenacross. 
Over 9 months ago
Paul
Top 10
Over 9 months ago
A: The FMF MegaBomb Header improves top-end power.
The FMF PowerBomb Header is tuned for bottom to mid performance.
Jeffrey
Q: I have a 2016 KTM 350 SX-F. Which header should I choose?
Over 10 months ago
Dan Gearhead
Top 25
Over 10 months ago
A: That would depend on the desired power curve or performance gains you are looking for, as well as your riding style / where you ride. The SX style header will be for more low end with a quicker over rev vs the standard will be a standard motocross style header/power curve.
Fitment

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# Part Numbers
Head Pipe
Product Variant Manufacturer Part #
FMF Factory 4.1 RCT Full Exhaust System 045420
Standard 041538
FMF Factory 4.1 RCT Full Exhaust System 041082
FMF Factory 4.1 RCT Full Exhaust System 044298
FMF Factory 4.1 RCT Full Exhaust System 045576
FMF Factory 4.1 RCT Full Exhaust System 045641
FMF Factory 4.1 RCT Full Exhaust System 045392
FMF Factory 4.1 RCT Full Exhaust System 044449
Standard 045591
FMF Factory 4.1 RCT Full Exhaust System 045592
FMF Factory 4.1 RCT Full Exhaust System 045499
FMF Factory 4.1 RCT Full Exhaust System 045515
FMF Factory 4.1 RCT Full Exhaust System 045467
Standard Single 041555
FMF Factory 4.1 RCT Full Exhaust System 045486
Standard 043368
FMF Factory 4.1 RCT Full Exhaust System 045572
FMF Factory 4.1 RCT Full Exhaust System 045466
FMF Factory 4.1 RCT Full Exhaust System 045577
Standard 045606
FMF Factory 4.1 RCT Full Exhaust System 045582
Stainless Steel 045364
Standard 045607
FMF Factory 4.1 RCT Full Exhaust System 042274
SX Style 045610
FMF Factory 4.1 RCT Full Exhaust System 042342
Standard 044299
Standard 045498
Standard 044316
Standard 042343
Standard 044422
Stainless 044439
Standard 044332
Standard 045622
Standard 044403
FMF Factory 4.1 RCT Full Exhaust System 045365
Standard 041376
FMF Factory 4.1 RCT Full Exhaust System 045342
Standard 041197
Standard 045604
Standard 041492
FMF Factory 4.1 RCT Full Exhaust System 045485
Standard 042181
Stainless Steel 045145
Standard 042277
Stainless Steel 045484
Standard 043238
FMF Factory 4.1 RCT Full Exhaust System 041490
Standard 043341
FMF Factory 4.1 RCT Full Exhaust System 043339
Standard 043310
FMF Factory 4.1 RCT Full Exhaust System 041518
Standard 041520
FMF Factory 4.1 RCT Full Exhaust System 042364
Standard 041539
FMF Factory 4.1 RCT Full Exhaust System 045421
Standard 042339
Standard 041519
Standard 042344
Standard 042338
Standard 045363
Standard 045362
Standard 042366
Standard 042365
Standard 044450
Standard Dual 041553
Titanium 044440
Standard 045620
Standard 041554
Standard 045624
Standard 041574
FMF Factory 4.1 RCT Full Exhaust System 045391
SX Style 042379
FMF Factory 4.1 RCT Full Exhaust System 045457
Standard 043369
FMF Factory 4.1 RCT Full Exhaust System 045514
Standard 045621
FMF Factory 4.1 RCT Full Exhaust System 045571
Standard 045623
FMF Factory 4.1 RCT Full Exhaust System 045581
Standard 045625
FMF Factory 4.1 RCT Full Exhaust System 045605
Standard 041428
SX Style 045612
Standard 041429
FMF Factory 4.1 RCT Full Exhaust System 045640
Standard 041459
Stainless Steel 045456
Standard 041491
Stainless Steel 045465
Standard 042249
FMF Factory 4.1 RCT Full Exhaust System 045458
Standard 042250
FMF Factory 4.1 RCT Full Exhaust System 041374
Standard 042276
FMF Factory 4.1 RCT Full Exhaust System 041457
Standard 043286
FMF Factory 4.1 RCT Full Exhaust System 042179
Standard 043340
FMF Factory 4.1 RCT Full Exhaust System 042094
Standard 043309
FMF Factory 4.1 RCT Full Exhaust System 043307
Standard 044358
FMF Factory 4.1 RCT Full Exhaust System 044314
Standard 044352
FMF Factory 4.1 RCT Full Exhaust System 042337
Standard 044421
FMF Factory 4.1 RCT Full Exhaust System 045361
Standard 044354
FMF Factory 4.1 RCT Full Exhaust System 045422
Standard 044402
FMF Factory 4.1 RCT Full Exhaust System 041458
Stainless Steel 045390
FMF Factory 4.1 RCT Full Exhaust System 045366
Slip-On
Product Variant Manufacturer Part #
Stainless Steel with Carbon Fiber Cap 043372
Natural Titanium With Stainless Steel Mid Pipe 042370
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 044455
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 045594
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap and Side Panel 041559
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 042333
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 045567
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 042292
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 043319
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 042290
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 042291
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 041474
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 041473
Blue Anodized Titanium 041508
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 045632
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 043347
Carbon Fiber 044445
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 043320
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 045558
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 044382
Blue Anodized Titanium With Titanium Mid Pipe 045569
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 044427
Blue Anodized Titanium With Titanium Mid Pipe 045596
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 044383
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 044443
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 041507
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 044453
Blue Anodized Titanium With Titanium Mid Pipe 044364
Natural Titanium 042375
Blue Anodized Titanium With Titanium Mid Pipe 044429
Titanium Anodized with Carbon Fiber Cap 045629
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 041440
Carbon Fiber With Side Panel 041560
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 042259
Aluminum With Stainless Steel Mid Pipe 045472
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 042267
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 044400
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 042286
Aluminum With Stainless Steel Mid Pipe 045566
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 043350
Natural Titanium With Titanium Mid Pipe 045568
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 043303
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 045570
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 045561
Natural Titanium With Titanium Mid Pipe 045595
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 044365
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 042357
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 044373
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 043364
Blue Anodized Titanium With Carbon Fiber End Cap 044409
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 042369
Natural Titanium With Titanium Mid Pipe 043348
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 042371
Natural Titanium With Titanium Mid Pipe 044428
Natural Titanium With Stainless Steel Mid Pipe 044454
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap and Side Panel 041525
Stainless Steel with Carbon End Cap 042374
Blue Anodized Titanium and Side Panel/ Fitment 21 041526
Titanium Anodized with Carbon Fiber Cap 042376
Natural Titanium With Titanium Mid Pipe and Side Panel 041527
Titanium Anodized with Carbon Fiber Cap 043373
Aluminum With Stainless Steel Mid Pipe 041517
Titanium Anodized with Carbon Fiber Cap 045633
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 045586
Aluminum with Carbon Fiber End Cap 045628
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 042330
Carbon Fiber 043365
Natural Titanium With Titanium Mid Pipe 042331
Natural 044444
Natural Titanium With Titanium Mid Pipe 045474
California Proposition 65

WARNING: This product contains chemicals known to the State of California to cause cancer, and birth defects or other reproductive harm. Wash hands after handling. For more information, go to www.P65Warnings.ca.gov.