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#1
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Stock Exhaust vs Cat-back Magnaflow
So I'm wondering, what is it that makes a cat-back set up, such as a magnaflow cat and resonator and muffler upgrade, more powerful than stock?
I realize the exhausts sound differently, but is an upgrade of that nature truly more powerful than stock, and if so, what is it that makes it more powerful? Are those components built differently? |
#2
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The magnaflow cat might net some more power if it flows better but as far as the rest of the route - size being equal I don't think anyone can honestly say it is better than stock.
That huge stock muffler actually flows quite well - as evidenced by the cutaway one member did. Now once you throw in pipe size and configuration changes the door is wide open.
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#3
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the aftermarket system, if done correctly, will result in a reduction of backpressure which will allow the engine to be more efficient in its use of a given amount of fuel - thus increasing the hp output of the engine. Not done correctly, the aftermarket system can actually decrease hp.... (i.e. reduce the backpressure too much and you can actually suck unburned fuel out of the exhaust system...)
-Bill
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#4
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Quote:
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1994 blue FWD Subaru SVX L with 86k and the original tranny *SOLD* My Cardomain page Now part of the DSM crowd: 1990 Mitsubishi Eclipse GSX |
#5
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check the very, very short header pipes on Top Fuel and Funny Cars -- the ignition event actually extends out of the pipes (ie flames!). I realize that this is an extreme case.... -Bill (realizing he should probably pull his exhaust system design handbook out...)
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#6
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Quote:
__________________
1994 blue FWD Subaru SVX L with 86k and the original tranny *SOLD* My Cardomain page Now part of the DSM crowd: 1990 Mitsubishi Eclipse GSX |
#7
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Quote:
__________________
1994 blue FWD Subaru SVX L with 86k and the original tranny *SOLD* My Cardomain page Now part of the DSM crowd: 1990 Mitsubishi Eclipse GSX |
#8
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Without removing all three of the OEM cats, there isn't much power to be gained by installing a cat-back exhaust. Maybe 5 hp.
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Mychailo :: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ :: 1995 Laguna Blue SVX L AWD 5MT (sold) Visit my locker SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads. |
#9
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Care to know the price??? I don't think ya really want to know... .... We'll just say that for three pieces, the price has four numbers and a coma after the first one
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2020 Subaru Outback Touring - Wife's first Subaru 2005 Volvo V70R - 5-cylinder love! :Heart: ** SOLD **1998 Subaru Legacy 2.5GT Wagon - MOST RELIABLE car I've ever owned ** SOLD **2006Subaru WRXSTi (Former "Boxer4Racing.com / Continential Tire" STi) - Built EJ22t block / EJ207 JDM STi "big port heads" - 9,000rpm MONEY PIT!!! ** SOLD ** 1995 "Tree-Hugger Green" SVX L AWD(5 MT) --- "Gumby" 130K miles #399 in MY95, my original love... |
#10
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Good point!! -Bill
__________________
Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#11
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#12
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If my time slips are any evidence...the exhaust would be a big help.
For mt 15.3, basically the only mod I had was exhaust. (Intake resonator removed, tranny resistor unplugged) I have the 3 OEM cats in place, with a single pipe coming back, into a Y-pipe, in to 2 flowmaster mufflers, and then out. Here's pictures.
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[/COLOR][/COLOR]-Scott My Locker 2014 Grey Ford Fusion 2.0 EcoBoost Bought: 12-5-14 2005 Silver Legacy GT Ltd 5mt. Bought: 3-3-07 Sold: 12-5-14 1996 Brilliant Red L (AWD). Bought: 6-14-04 - Sold: 3-3-07 - 15.370 @ 89.65 1992 Claret/black LS #4086 (GF's). Bought: 6-30-04 - Sold: 7-29-07 1994 Pearl White LSi Bought: 2001? Sold: 2004? |
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