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How much restriction?

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Old Feb 6, 2006 | 04:02 PM
  #1  
Dirtbik3r's Avatar
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From: LaGrange (10min from Poughkeepsie), NY
Car: 1992 Camaro RS - not real slow anymore...
Engine: SPDC 360 MAF EFI /w a Holley Stealth Ram
Transmission: T5 untill it blows up from to much torque
Axle/Gears: Ford 9" /w auburn pro & 3.89's
How much restriction?

Hooker LT's (3" collectors)
Hooker 3" Catback

Stupid shop gave me a 2.5" y pipe. WTF

How much hp is this robbing. Lets say (just for this thread) we are starting with 300rwhp...
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Old Feb 6, 2006 | 05:37 PM
  #2  
Air_Adam's Avatar
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From: Saskatoon, SK, Canada
Car: '83 Z28, '07 Charger SRT8
Engine: 454ci, 6.1 Hemi
Transmission: TH350, A5
Axle/Gears: 2.73 posi, 3.06 posi
Which part is 2.5"? If the pipes coming off the collectors are 2.5", into a single 3" pipe, then I'd say very little restriction at all, really.
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Old Feb 6, 2006 | 05:54 PM
  #3  
Dirtbik3r's Avatar
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From: LaGrange (10min from Poughkeepsie), NY
Car: 1992 Camaro RS - not real slow anymore...
Engine: SPDC 360 MAF EFI /w a Holley Stealth Ram
Transmission: T5 untill it blows up from to much torque
Axle/Gears: Ford 9" /w auburn pro & 3.89's
Originally posted by Air_Adam
Which part is 2.5"? If the pipes coming off the collectors are 2.5", into a single 3" pipe, then I'd say very little restriction at all, really.
Yes, i mean the "Y-Pipe(2 to 1)" coming off the 3" collectors into a single 3" catback.

But it isn't a genuin y pipe. They made it like a T shape and not a Y. It is setup like shown below. The reason im asking this question is because it felt like it had 10x as much pull running open headers...
Attached Thumbnails How much restriction?-exhaust.jpg  
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Old Feb 6, 2006 | 06:37 PM
  #4  
superGMman's Avatar
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From: San Leandro(Oakland)
Car: '92 Toyota Pickup
Engine: 22R-E
Transmission: 5sp Manual
Axle/Gears: 4:??
T pipes are not meant for performance
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Old Feb 6, 2006 | 06:42 PM
  #5  
Dirtbik3r's Avatar
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Joined: Oct 2003
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From: LaGrange (10min from Poughkeepsie), NY
Car: 1992 Camaro RS - not real slow anymore...
Engine: SPDC 360 MAF EFI /w a Holley Stealth Ram
Transmission: T5 untill it blows up from to much torque
Axle/Gears: Ford 9" /w auburn pro & 3.89's
Originally posted by superGMman
T pipes are not meant for performance
I know this, they obviously didn't. I was at college. So i sent my father to the shop. Also, it is not mandrel bent. *** was I pissed when I put her on the lift. So back to the point, how much is this restricting?
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Old Feb 6, 2006 | 09:22 PM
  #6  
ShiftyCapone's Avatar
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From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Originally posted by Dirtbik3r
I know this, they obviously didn't. I was at college. So i sent my father to the shop. Also, it is not mandrel bent. *** was I pissed when I put her on the lift. So back to the point, how much is this restricting?
You can't put an exact value on it. The crimped bends make the pipes even less than 2.5" as well.
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Old Feb 6, 2006 | 09:37 PM
  #7  
1989GTATransAm's Avatar
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From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
Hard to say how much HP this is costing you but quite a lot. I would say a minimum of 30 and could be a lot more based on some stories Dyno Don has told from what he has seen over the years.
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Old Feb 6, 2006 | 10:27 PM
  #8  
superGMman's Avatar
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From: San Leandro(Oakland)
Car: '92 Toyota Pickup
Engine: 22R-E
Transmission: 5sp Manual
Axle/Gears: 4:??
I'd say it's holding you back enough to not keep it, why not attempt to have a shop create a 3" y?

With exception to the "T-pipe" you have a great setup.
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Old Feb 6, 2006 | 11:06 PM
  #9  
Joseph Andres's Avatar
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From: NJ, USA
Car: 1991 GTA Convertible
Engine: 350
Transmission: 700R4
Axle/Gears: 3.73
Why not try a Y-pipe from www.Mufflex-Performance.com? It bolts right up if you get a 4" to 3" adapter. I think what you're looking for is on pages 7 and 8. It's 2 3" into 1 4" collector. Looks something like this:
Attached Thumbnails How much restriction?-exhaust-005.jpg  
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