So many downpipes...help - Subaru WRX Forum
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#1 Old 02-10-2006, 06:16 PM
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So many downpipes...help

wuts up guys, i have an 05 WRX and finally got sum money to throw around so i figured hey not throw it into the car...my question is wut is the difference between all the downpipes, i mean i kno the basics such as diameter, catted, divorced....but which would you guys go with, i appreciate the help
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#2 Old 02-10-2006, 06:27 PM
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There isn't really a big difference between them, it all comes down to preference. Just get a good bellmouth downpipe and you'll be good to go. A lot of people will tell you to go with a Helix because it's good quality for a good price. Just be careful of some of the cheap ones on Ebay. I have an Invidia and love it, but Helix is also excellent quality.

P.S. you might want to get an uppipe and do it at the same time as the downpipe.

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#3 Old 02-10-2006, 08:14 PM
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Yea I really like the HELIX system that is what I am planning to get once my tax money comes in hehe. I would recommend that you get a TBE (or at least up/dp) from all one brand to assure fitment. You do not have to do it that way but I think it just makes it easier that way. Like Bradley said it's recommended that you do the uppie too since you have the DP out already and it just saves time in the future.
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#4 Old 02-10-2006, 09:50 PM
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I agree with what everyone has said. There just doesn't seem to be that big of a difference as long as you are going with a reputible brand. I personally have the Helix up/down combo (great deal and quality) with a GReddy SP2 cat back and I couldn't be happier.
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#5 Old 02-10-2006, 10:29 PM
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Personally, I the reason I went with Perrin because not only is it a bellmouth design, but it also has a splitter that seperates the exhaust gases (divorced) from the wastegate gasses. Whether or not the other downpipes have it, I don't know. Can't go wrong with 321 Stainless either.

Jon
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RIP Colin McRae
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#6 Old 02-10-2006, 11:10 PM
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Full Helix here as well. Very nice quality and price. No fitment issues whatsoever.

My car is well, it's like 10 lbs of shit in a 5 lb bag...

<------ Click to see what I'm workin' with. ;)
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#7 Old 02-11-2006, 08:20 AM
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I just received the Cobb downpipe yesterday.... What was i thinking... Its way too nice to put under my car..... I think I'll just hang it on the wall... This thing is really a work of art...
On second thought I'm putting it on tomorrow.. Can't wait.

Big Jae -
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#8 Old 02-11-2006, 04:37 PM
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thanx guys, i really appreciate the help, ill prob be going with the helix downpipe and up pipe
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#9 Old 02-19-2006, 06:28 PM
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how does the perrin up-pipe and down-pipe compare with helix's?
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#10 Old 02-19-2006, 06:56 PM
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There both excelent DP, the only difference is that one is a bell mouth (Helix) and the other is a divorced style (Perrin)

My turbo's fixed and a lot better =)
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#11 Old 02-19-2006, 08:38 PM
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The Perrin uppipe doesn't have the flex section like the Helix. The flex section allows the pipe to be a little more forgiving as far as leaks go. The Perrn also doesn't have a EGT bung in it, where the Helix does.

You can't really go wrong with either pipe, just get new gaskets for whichever one you choose. Some people might say that you don't need to, but it's a good idea to replace gaskets when you change a part out.

My car is well, it's like 10 lbs of shit in a 5 lb bag...

<------ Click to see what I'm workin' with. ;)
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#12 Old 02-19-2006, 09:46 PM
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Quote:
Originally Posted by 9d2TSi
The Perrin uppipe doesn't have the flex section like the Helix. The flex section allows the pipe to be a little more forgiving as far as leaks go. The Perrn also doesn't have a EGT bung in it, where the Helix does.

You can't really go wrong with either pipe, just get new gaskets for whichever one you choose. Some people might say that you don't need to, but it's a good idea to replace gaskets when you change a part out.
Sorry, I gotta defend my exhaust. I have a full Perrin exhaust, uppipe, downpipe, and catback. Although I don't remember where the flex section is, there is a flex section in my exhaust (probably in the connector of the catback). I also have never heard of anyone leaking with the Perrin.

As for the EGT bung. Although it does not come with a bung for it, they determined it would not affect performance, and they include a fix for it that's easier to install than the sensor itself.

Like he said though, you can't go wrong with either one.

Jon
"We live for a good time, not a long time."
RIP Colin McRae
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#13 Old 02-20-2006, 06:51 AM
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Actually, I should've been more specific. I was refering to the uppipe when I was talking about the flex, not the exhaust. Sometimes when people install the non-flex pipes, they leak. I've noticed incidents with both the Perrin and the Cobb doing this. This was surely due to improper installation, but it still happens sometimes.

No need to defend your parts Jon, I wasn't downing them. I just should've been more clear. Sorry about that.

My car is well, it's like 10 lbs of shit in a 5 lb bag...

<------ Click to see what I'm workin' with. ;)
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#14 Old 02-20-2006, 08:09 AM
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i say perrin dp or invidia v3 dp. and definately do your uppipe at the same time. otherwise you will be taking off your downpipe when you do it anyway. i would get a uppipe with a fles section such as the helix!
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#15 Old 02-20-2006, 08:29 AM
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No biggie, I wasn't freaking out or anything I should also mention so it doesn't confuse the bejesus out of newbies... the EGT thing is also in the uppipe.

Jon
"We live for a good time, not a long time."
RIP Colin McRae
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