stock wrx exhaust vs sti - Page 2 - Subaru WRX Forum
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post #16 of 33 Old 08-25-2008, 02:57 PM
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the dyno charts I've seen always show little to no gain. The ones that I've seen that show gain are often in conjunction with tuning which is misleading. They remove the cat and then raise the boost and then sight the increased boost as the gain from the cat removal when they aren't really related.

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post #17 of 33 Old 08-25-2008, 02:57 PM
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I would consider the downpipe a serious gain
it didnt feel like i gained hardly anything at all when i did my DP. might just be me though.
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post #18 of 33 Old 08-25-2008, 03:29 PM
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Quote:
Originally Posted by mosc View Post
the dyno charts I've seen always show little to no gain. The ones that I've seen that show gain are often in conjunction with tuning which is misleading. They remove the cat and then raise the boost and then sight the increased boost as the gain from the cat removal when they aren't really related.
I might have been misleading in my assertion. I dont think that you will get HP gains out of the Up pipe cat delete, but you stand a chance to gain better flow out of it, and you also reduce the risk of your cat disintegrating and going into your turbo and then into your engine (I understand that it is not a very common occurrence, but it is still possible).
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post #19 of 33 Old 08-25-2008, 03:49 PM
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it didnt feel like i gained hardly anything at all when i did my DP. might just be me though.
When i got my downpipe in, it was a huge gain.
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post #20 of 33 Old 08-25-2008, 04:30 PM
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From what i've researched, usually aren't aftermarket UP's the same diameter as even the stock one? Or barely larger? If you gain HP out of the UP it's going to be hardly squat, sure it MIGHT spool sooner, but it's not going to be noticeable; right? Maybe 1/2 a hp? With a tune.

And YES! the DP is probably THE singlemost restrictive peice in the system! Some vehicles can gain up to 30-50whp (with or even without tunes)

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post #21 of 33 Old 08-25-2008, 06:41 PM
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Not all UPs' are the same. Especially if your getting the 3" inlet for a turbo that needs that upgrade. SPT SRI's claim to give about 1 extra PSI if I'm not mistaken and slightly quicker spool. But, I don't think it's going to convert to any real gains...because its just the turbo spooling quicker.
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post #22 of 33 Old 08-25-2008, 07:01 PM
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How would an intake raise the boost on it's own? It's going to magically hold the wastegate shut? If they claim that, they're idiots.

Quote:
Originally Posted by awd4life
I might have been misleading in my assertion. I dont think that you will get HP gains out of the Up pipe cat delete, but you stand a chance to gain better flow out of it, and you also reduce the risk of your cat disintegrating and going into your turbo and then into your engine (I understand that it is not a very common occurrence, but it is still possible).
This is true. It is a mod that needs to be done prior to getting a larger turbo for the 02-05s for sure. It's just not going to deliver gains on it's own on an otherwise stock WRX.

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post #23 of 33 Old 08-25-2008, 08:29 PM
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ok, correction. I think they're claiming it acts like a 1 psi increase. Not that it actually makes a psi change because of the quicker spool. Sorry, if I didn't explain that properly.
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post #24 of 33 Old 08-25-2008, 11:46 PM
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Thanks for the clarification. Im learning tons on this forum, I was about to buy an intake before anything else. Luckily I found this site and deceided to go with the AP before anything else! Then obviously a downpipe thanks to this chat.

Thanks again,
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post #25 of 33 Old 08-26-2008, 02:57 PM
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Quote:
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When i got my downpipe in, it was a huge gain.
weird... what type of DP do you have? (as far as brand.)
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post #26 of 33 Old 08-26-2008, 03:33 PM
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Cobb catless downpipe. I know i couldve got one for cheaper but i wanted a name brand dp. didnt want to go ebay route or anything like that. Did you get tuned for the downpipe?
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post #27 of 33 Old 08-26-2008, 03:37 PM
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nope... didnt bother then. but ive had a remap since. that MIGHT have been what it was... but i have no idea. It was weird because ive read countless posts of people saying the Downpipe makes a huge difference, and when i did mine, i was just like... wtf? but maybe thats what it was...
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post #28 of 33 Old 08-26-2008, 04:47 PM
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Yeah, maybe you were not tuned thats why. Get tuned so you can get the most out of all the mods you have done.
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post #29 of 33 Old 07-23-2014, 11:26 PM
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Lightbulb Stock dp sti dp

I have a sti up pipe to a wrx dp and mid pipe and a sti axel back And before had all wrx TBE and honestly I can't feel a difference just hear the difference that's all.
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post #30 of 33 Old 07-25-2014, 12:56 AM
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Holy thread revival batman!! No differences in WRX vs STI uppipes unless you have a pre 05 WRX which has a cat in the pipe. Pretty sure the DP's are not different between the two and I dunno about the cat-back's.

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