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07-16-2013, 12:37 AM
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#1 |
 
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Do flowmasters really hurt hp?
I have been seeing a lot of threads lately about how flowwmasters hurt your hp. Is there any truth to this? I have the American Thunder on mine but I was thinking about taking them off and going straight pipe. Any benefits to this?
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 Black cars are not hobbies, they are an obsession |
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07-16-2013, 12:42 AM
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#2 |
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Search Ninja
Drives: 2010 Black 2SS/RS A6 Join Date: Oct 2009
Location: Central Ark
Posts: 7,183
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I'm sure it's not ALL FM's but i'd bet some of them are fairly restrictive. As far as yours, I have no idea. Just wanted to chime in to say that it doesn't hold true across the entire product line.
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2010 Black 2SS/RS A6
Halltech CF 102 fed GPI modded intake manifold Bo (knows) White ported TB Kooks LT's/ Dynomax VT Pfadted (springs/sways) Dyno tuned by Rhino and GPI I once parallel parked a train. |
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07-16-2013, 12:55 AM
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#3 |
         
Drives: 2013 SS Join Date: May 2013
Location: DFW
Posts: 4,102
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Not all and depends on the setup. I know i gained 37rwhp by removing my FM for a 4" catback but then again I was running a nice lil turbo.
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07-16-2013, 04:01 AM
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#4 |
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spacecowboy, that hood you have on there hurts your HP too. You should do a straight up trade with my stock hood.
 That hood is sexy! Is that the Sinister or MPD1?
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2011 Camaro 2SS/RS, Circle D 3200, ADM Transmission Cooler, BTR Valvetrain, Cam Motion .621 .595 228/244 113+4, ARH 1 7/8 full exhaust, Cold Air Inductions, Katech C5R TC, Melling HV, BTR SLR lifters, Trunion Upgrade, LS2 Dampner, LS9 head gaskets, Bo White PTB, MM can, GFX, Subs, B&M Deep transmission pan,
Holley fuel rail, Proform valve covers, relocated coil packs  |
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07-16-2013, 08:38 AM
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#5 |
Drives: Florida Speed & Power Join Date: Jan 2011
Location: Pinellas Park, FL
Posts: 3,185
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There is minimal gains/losses if any from MOST exhaust systems.... That said, the main thing typically affected is the back pressure which can make it FEEL slower......but you really are not losing anything...
Unless you are moving massive amounts of air (BIG NA or FI) then the performance out of an exhaust system(s) is minimal at best. |
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07-16-2013, 10:27 AM
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#6 | |
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Quote:
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Black cars are not hobbies, they are an obsession |
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07-16-2013, 10:56 AM
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#7 |
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Chu no guat a hasa is?
Drives: 14 Jeep G Cherokee Overland HEMI Join Date: Jun 2011
Location: Some where in So Cal
Posts: 4,273
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FM AT!!!
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11 2SS/RSL99No Longer Stock (Sold) 6/19/14:AAC Plasma DRL's | Plug n play harness | Elite CC | Tint: 35% & 5% | LED Dome light | Show-N-Go Plate Holder | Flowmaster AT | C.A.I. Intake | VMAX CNC Spiral Ported TB | Husky Splash Guards
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07-16-2013, 08:53 PM
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#8 | |
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Didn't mess up his mod setup so I think you are good.....
The only thing I seen people do was lose back pressure from getting it too big which will effect torque numbers.......
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07-16-2013, 09:51 PM
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#9 |
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V8 Lounge member #2
Drives: 2001 Ws6 Join Date: Sep 2009
Location: Burbank,IL
Posts: 6,373
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I was gonna chime in but THE TROLL HAS ARRIVED! Id never thought id ever hate the abbreviation "BJ" but he has made me! Damn you "BJ"!
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2001 ws6, 40k miles, Ls3 416 stroker, short block built by PER the rest by me. LPE Ls3 heads milled to 12-1 comp, FAST 102, NW 102, kooks 2", dual DMH cutouts, Magnaflow C/B, BTR cam + springs. Full UMI suspension.
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07-16-2013, 10:16 PM
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#10 | |
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Quote:
 One day we will meet and there will be none of this  Just a couple of cold ones down the hatch..... 
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07-16-2013, 10:19 PM
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#11 | |
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Search Ninja
Drives: 2010 Black 2SS/RS A6 Join Date: Oct 2009
Location: Central Ark
Posts: 7,183
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Quote:
__________________
2010 Black 2SS/RS A6
Halltech CF 102 fed GPI modded intake manifold Bo (knows) White ported TB Kooks LT's/ Dynomax VT Pfadted (springs/sways) Dyno tuned by Rhino and GPI I once parallel parked a train. |
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07-16-2013, 10:48 PM
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#12 |
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Chu no guat a hasa is?
Drives: 14 Jeep G Cherokee Overland HEMI Join Date: Jun 2011
Location: Some where in So Cal
Posts: 4,273
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__________________
11 2SS/RSL99No Longer Stock (Sold) 6/19/14:AAC Plasma DRL's | Plug n play harness | Elite CC | Tint: 35% & 5% | LED Dome light | Show-N-Go Plate Holder | Flowmaster AT | C.A.I. Intake | VMAX CNC Spiral Ported TB | Husky Splash Guards
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07-16-2013, 11:01 PM
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Some don't believe in it but I only go by what I have seen racing over the decades...... some back pressure seems to keep the torque numbers up a bit.... not crazy pressure.... I know this a hot button so everyone will take a side so I won't argue with different perspectives....... I think explaining this in the manner of stepped headers or 1 3/4 headers or 1 7/8 headers or Y 1 7/8 headers..... they all do well but the 1 3/4 will get you out hole but the 1 7/8 if it has enough distance will catch ya..... The step headers will do it all in getting you out the hole and run away... But it all comes down to the driver as well..... Having said that getting back on topic I think going above 3" in exhaust might be much if you aren't adding much in the mods RWHP department.....
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07-16-2013, 11:01 PM
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#14 |
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E.B.A.H.
Drives: you wild... Join Date: Mar 2007
Location: In the happy padded room wearing a jacket that makes me hug myself...
Posts: 18,421
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If you're worried about backpressure, do what I did and get the HP series muffler (Originally the Flowmaster Hushpower).
Baltimore John is correct. I can probably contact someone from Flowmaster get them in here and give you specifics if you wish. |
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