hp/torque difference? - Subaru WRX Forum
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post #1 of 24 Old 10-08-2004, 11:52 AM Thread Starter
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hp/torque difference?

vf34 turbo, fmic, sti injectors, walbro fuel pump, aftermarket upipe, utec, greddy evo2 catback . . . .

would there be a big difference in hp/torque if i have a stock downpipe with the above setup as opposed to an aftermarket downpipe . . . . the reason i am asking is because the emmission regulations are strict here in PA and i don't want to have to deal with swapping out exhaust parts every year so i was planning on leaving the stock downpipe as is and just replacing the uppipe (so that i can up the boost) . . . .
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post #2 of 24 Old 10-08-2004, 12:11 PM
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My only quick educated guess would be it would be harder to spool your turbo since there will be more restrictions on your exhaust flow leaving the turbo. Maybe you can't make as much boost?
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post #3 of 24 Old 10-08-2004, 02:25 PM
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from what i have seen, most downpipe swaps yeild considerable hp/trq gains.

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post #4 of 24 Old 10-08-2004, 03:41 PM
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the replacement of the down pipe is a must if you want power.
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post #5 of 24 Old 10-08-2004, 06:01 PM
 
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Yeah many you need that or else the turbo is gonna have crazy backpressure which isn't good. Get a DP w/ a cat. TXS, Stromung, Helix, etc.
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post #6 of 24 Old 10-08-2004, 07:38 PM
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Deffinitly, at least get a down pipe with a cat. if your doing a turbo and fuel up grade you need a down pipe and with a good tune and a down pipe with a cat you should be fine
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post #7 of 24 Old 10-09-2004, 05:36 PM Thread Starter
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so if i went with a bosal or stromung dp this would leave the stock midpipe (cat) . . . this would then be safe with those upgrades? . . . . will i still be able to pass emmissions testing?
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post #8 of 24 Old 10-10-2004, 01:42 PM
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You should be able to get a complete down pipe with a built in high flow cat and with a good tune be able to pass
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post #9 of 24 Old 10-10-2004, 04:04 PM Thread Starter
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i was looking at the exhaust diagram that is in Kobi's modification guide and see that the rear O2 sensor is in the stock midpipe (cat) . . . if i just replace the actual downpipe and leave the stock midpipe, will that still cause a CEL?
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post #10 of 24 Old 10-10-2004, 08:10 PM
 
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It might, it might not. All it takes is one bad blast of air to set it off.
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post #11 of 24 Old 10-11-2004, 09:51 AM
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I dont think inspection is very strict in pa.
No sniff test if you pass computer test. They MIGHT do visual but get "friendly" with youre inspection garage.
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post #12 of 24 Old 10-11-2004, 09:55 AM
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also, there's no engine mgmt in you list on mods?
Cobb a.p. will delete cels involved with stage 3 and obd (?)computer will pass you at inspection.
sorry utech.

Last edited by RPFRIDE; 10-11-2004 at 11:22 AM.
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post #13 of 24 Old 10-12-2004, 03:22 PM
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This is what you do. Go ahead and get the exhaust setup that you want. But when you do it, get a check engine light fix. If the light doesn't go off, to their computers technically there is no error, so it won't throw their monitors off. I have friends that have done that, and have no problem with emissions. And their cars definitly aren't legal. But this all depends on how they do things in PA. Make sure that they plug the car up and not check exhaust. They usually just plug the car up, and it checks for error and engine light trips.
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post #14 of 24 Old 10-12-2004, 03:36 PM
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Well, if you can work a wrench, you can change a downpipe. I can change one in about 15 minutes. 7 bolts and an O2 sensor.
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post #15 of 24 Old 10-12-2004, 04:47 PM
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Sh!t, in 15 minutes! I need you when I get mine. I'm just worried about too much heat from the downpipe without a heat shield.
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