Have any of you out there put a single in/ single out flowmaster on a new Screw? If so what series 40, 50, 70, and if you haven't yet why? Also, do these mufflers resonate inside the cab. I want to order a series 70 based on the product manual for inside noise rating, but will the exterior sound still produce! Thanks, Jackie

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2001 SCREW STOCK

 

Many here, myself included, like the 40 series muffler. I have read some posts that say there is a hint of resonence in the cab when at certain highway speeds. Check some of the other Flowmaster posts and see. Most of the people who use them say the 40 series really performs both for added horses and desired sound and that this out weighed any in cab noise. I've also read a few posts from those that initialy went with the 70. Then after switching to the 40 said they liked it much better. Check some other posts, I'm sure you'll find the info you're looking for. Welcome to the best F-150 site on the web!

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Stock Stuff:
Y2K SCab 4X4, Chesnut Metallic, 5.4L, 3.55 Limited Slip, Skid Plates, Factory AM/FM/CD, 40/60 Split Bench, Sliding Rear Window, Towing Package and Keyless Entry.

Extras so far:
305/70X16 GY Wrangler ATS on American Eagle Series 146 chrome wheels.

Future plans:
Airbox mod/FIPK, Flowmaster 40 Series muffler, stainless exaust tip, tint windows, spray in liner (or Herculiner haven't decided), stainless step bars, hood deflector, chip? we'll see.

 

I have a 3 inch cat back installed in the factory position with a FloMaster 40 series. The sound is just right! Hardly noticable at idle or light acceleration but kicks in when you do. I get a little bit of cab noise about 80 to 85 mph. I do a lot of freeway dring and it does not bother me.

Would recommend the 40 series maby 50 series if you are real noise conciouse

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2001 SuperCrew 4x4 "Mighty Whitey" Lariat "Loaded". Oxford White (No Stickers, Yuck!)
-Ultra Polish Alum. Wheels(type 160)
-BFG 285 R16 ATs
-Billet Grill
-Stainless Werks Nerf Bars
-KC Driving Lights (in Grill)
-WMS Volocity Tube
-K&N Filter
-Husky Mats, front & rear
-Husky Mud Flaps
-GPS (on board)
-Wired for phone (no accidents!)
-SnugTop, SnugLid Tonneau
-Killer Tint
-FlowMaster 40, 3" catback w/ 4" Tip
-AmsOil 5w40 & Filter

To Come:
-Superchips, flip chip
-Rancho RS 9000's & kit
-Painted bug def (white)
-Brake Dust Cvrs (painted white)

 

I just got a 50 SUV Performance Flowmaster muffler installed on my F150. It is surprisingly quiet. Can barely hear it at idle standing outside. At idle it used to sound like two squirrels masturbating in the oem muffler but now it has a lower kind of rumble. It gives a deep tone when pushed but quiets down to nothing cruising in the city. There is a resonance at 1600 to 1700 rpm but it totally goes away outside of the rpm band. It's 70 mph with a 3.08 rear btw. If you want the deep rumple of a performance truck try the 40 series, for a stealthy low profile sound the 50 SUV is great.
BTW, a lot of the poping and crackling sound after driving went away with the Flowmaster.

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2000 F150 XLT 4x2 ExtCab Styleside 4.6 Auto in Island Blue.
Dark Graphite interior, White face gages, Superchip, K&N filter,
Airbox Mod, PowerAid, Flowmaster 50, LeBra soft tonneau, LineX,
Ford Bugshield, 2 inch lowering shackles, Hellwig Swaybar,
Monroe Reflex Shocks, 100w Head and Fog lights, Clifford Alarm,
Blaupunkt CD, JBL comp speakers, Punch subwoofers, ECM Jammer Pod.

 

I just had FM Delta flow 50 series installed on my truck. IMHO it's a good compramize for power gains and nice sound without being anoying loud.

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F150IslandBoy
1997 F150 Lariat
SuperCab, Toreador Red w/ Gold, Styleside, 4.6L, A/T, A/C, 3.55 3800 Limited Slip, Class 3 Tow Package, Leather Captain Seats, Sliding Rear Window.
Modifications:
Airaid FIPK, Flowmaster Delta Flow 50 Series, Bugflector II, Viper 500ESP Alarm, Pendaliner Bedliner, Cobra Trapshooter 3 Radar Detector, CARR Tubular Nerf Bars, NFA 1400 Compact 55W=>85W Halogen O.E. Lights, Durango 255/70R16, Chrome eyelet tie downs, Smoked front lic. plate cover.

 

Anyone hear of a 60 series? Is it old? Asking because a call to the local muffler shop said they had the 40 and 60.

 

F150aGoGo,

Check out FM website www.flowmastermuffler.com. If I recall right the have 30,40,50 & 70 series but no 60 series.

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F150IslandBoy
1997 F150 Lariat
SuperCab, Toreador Red w/ Gold, Styleside, 4.6L, A/T, A/C, 3.55 3800 Limited Slip, Class 3 Tow Package, Leather Captain Seats, Sliding Rear Window.
Modifications:
Airaid FIPK, Flowmaster Delta Flow 50 Series, Bugflector II, Viper 500ESP Alarm, Pendaliner Bedliner, Cobra Trapshooter 3 Radar Detector, CARR Tubular Nerf Bars, NFA 1400 Compact 55W=>85W Halogen O.E. Lights, Durango 255/70R16, Chrome eyelet tie downs, Smoked front lic. plate cover.