help with first mods and exhaust ?s
03-05-2004, 12:55 PM
#1
Guest
Posts: n/a
help with first mods and exhaust ?s
I have an 02 wrx and i want to start on the mods, i know i want exhaust up pipe, and turbo back. If i get a cat back exhaust then a down pipe will that then be a turbo back or will i also need the mid pipe?I also see that alot of people are talking about throwing a cel in the up pipe? I have no idea what this means so could someone please inform me. I also heard that if you live in a cold region that it is best to have an up pipe with a flex is this true, if so who makes one. I also would like to know if it would be worth it to buy a chip after these mods and if so what are some of my options. I am also looking into the NX express ntercooler kit so any information on that would be helpful.
03-05-2004, 01:16 PM
#2
the search button is your friend.
If i get a cat back exhaust then a down pipe will that then be a turbo back or will i also need the mid pipe?
I also see that alot of people are talking about throwing a cel in the up pipe?
if so who makes one
I also would like to know if it would be worth it to buy a chip after these mods
gluck bud and welcome to the i-club!
03-05-2004, 01:22 PM
#3
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Join Date: Apr 2003
Location: Trying to figure out something creative to put her
Posts: 1,348
Car Info: 2005 CGM WRX Wagon
With a cat-back exhaust, you will need to replace the downpipe and the midpipe to have a turbo-back. Look at this diagram:
https://www.i-club.com/forums/showth...xhaust+diagram
Having said that, there are some downpipes that replace both the stock downpipe and midpipe (Helix and others) and there are some that replace just the downpipe (Bosal and others). However it is argued that one system (turbo-back) by the same manufacturer produces better power than piecing one together. There are no hard numbers to back this up.
Throwing a CEL is when the Check Engine Light comes on after replacing one of the cats. There are fixes for this.
Helix makes a flex uppipe, and supposedly they are better at guarding against leaks.
Yes, buying a "chip" would be a good idea. That would maximize the power you get out of putting these parts on your car. Vishnu and Conn are a few choices for engine management.
Hope that helped...
https://www.i-club.com/forums/showth...xhaust+diagram
Having said that, there are some downpipes that replace both the stock downpipe and midpipe (Helix and others) and there are some that replace just the downpipe (Bosal and others). However it is argued that one system (turbo-back) by the same manufacturer produces better power than piecing one together. There are no hard numbers to back this up.
Throwing a CEL is when the Check Engine Light comes on after replacing one of the cats. There are fixes for this.
Helix makes a flex uppipe, and supposedly they are better at guarding against leaks.
Yes, buying a "chip" would be a good idea. That would maximize the power you get out of putting these parts on your car. Vishnu and Conn are a few choices for engine management.
Hope that helped...
03-05-2004, 01:58 PM
#6
Registered User
Join Date: Mar 2003
Location: Wilton,CT
Posts: 168
Car Info: Sold My Stage 4+ Wa-Goon :(
IGOTRBO: Rock on with your purchase; as for mods; id say get a regular up-pipe.. no flex needed (yes yes this can be argued)... however I live in the NE and I haven't had a problem with it yet (~9months); get a dp (you could go for an hks if you want to go cheap; dyno proven, you aren't losing too much hp without a bellmouth; i've seen it with my own eyes). Then from there just get a catback. All in all I pieced my exhaust together for ~490$ -- That includes the HKS downpipe, a TurboXS Up-Pipe and then a used cat-back.
As for the CEL; thats the check engine light. The up-pipe might throw it its the EGT Temperature. Just unplug the sensor, plug the hole in the uppipe with a bolt. Then bend a 2.2kOhm resistor into the sensor (female end); and gasket maker it all up, nice and water-tight. And the CEL will be gone (after you pull the code/reset the computer -- i.e. pull the ground off the battery).
Other than that; if you have the exhaust and up-pipe.. I'd say go buy a used unichip ~120$ (ebay). Have it reflashed to either stage 2 or three. Depending on what you really want/need. I have an exhaust, up-pipe, intercooler hoses, the ABC (Auxillary Boost Controller) that came with the unichip, a forced performance 18g Turbo and I'm running a stage 3 chip.
As for the ntercooler NX express kit. I'd say save your money and put some more to the side and get a nice Hyperflow Version 2 Top Mount Intercooler.
Thats just my .02. Right now Ive had enough with modifying my car + i've heard that Stage 4s only last to ~80k or so ???
??? soo.. I'm thinkin about either goin all out with custom throttle-bodied twin turbo setup, or just saying f-it and just goin nuts with my suspension.
Thats the next thing you should really think about.. Swaybars, strut bars and endlinks. Make that car nice and tight.
Anyway, I could go on and on, and I bet you 50$ people will tell me i'm wrong in what i said; who cares.. just my opinion.
Have a Good one!
-G
As for the CEL; thats the check engine light. The up-pipe might throw it its the EGT Temperature. Just unplug the sensor, plug the hole in the uppipe with a bolt. Then bend a 2.2kOhm resistor into the sensor (female end); and gasket maker it all up, nice and water-tight. And the CEL will be gone (after you pull the code/reset the computer -- i.e. pull the ground off the battery).
Other than that; if you have the exhaust and up-pipe.. I'd say go buy a used unichip ~120$ (ebay). Have it reflashed to either stage 2 or three. Depending on what you really want/need. I have an exhaust, up-pipe, intercooler hoses, the ABC (Auxillary Boost Controller) that came with the unichip, a forced performance 18g Turbo and I'm running a stage 3 chip.
As for the ntercooler NX express kit. I'd say save your money and put some more to the side and get a nice Hyperflow Version 2 Top Mount Intercooler.
Thats just my .02. Right now Ive had enough with modifying my car + i've heard that Stage 4s only last to ~80k or so ???
??? soo.. I'm thinkin about either goin all out with custom throttle-bodied twin turbo setup, or just saying f-it and just goin nuts with my suspension.Thats the next thing you should really think about.. Swaybars, strut bars and endlinks. Make that car nice and tight.
Anyway, I could go on and on, and I bet you 50$ people will tell me i'm wrong in what i said; who cares.. just my opinion.
Have a Good one!
-G
Last edited by WRXWagon203; 03-05-2004 at 02:03 PM.
03-05-2004, 02:31 PM
#7
Guest
Posts: n/a
WOW thanks for all the info so fast, ill definately look into a chip to and does hks make a cat back without the carbon fiber muffler? What is the bellmouth that the hks does not have and does the hks down pipe get rid of the 3rd cat?and thanks again fellers.
03-05-2004, 02:49 PM
#8
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Join Date: Apr 2003
Location: Trying to figure out something creative to put her
Posts: 1,348
Car Info: 2005 CGM WRX Wagon
There are three different designs for the downpipe. bellmouth, divorced wastegate (twin-dump), and regular. These refer to the side that bolts to the turbo.
Here's what a bellmouth DP looks like:
Here's what a divorced wategate (twin-dump) looks like:
A normal one (like the factory one and the HKS) would be like the twin-dump except there is only one hole. Instead of the wastegate having an area for its exhaust to go, there is a flat section of metal that the wastegate gasses run into. The idea is that the wastegate gasses have a smoother exit path with the bellmouth or twin-dump than with the regular. The theory is there is more power with smoother exhaust flow.
Here's what a bellmouth DP looks like:
Here's what a divorced wategate (twin-dump) looks like:
A normal one (like the factory one and the HKS) would be like the twin-dump except there is only one hole. Instead of the wastegate having an area for its exhaust to go, there is a flat section of metal that the wastegate gasses run into. The idea is that the wastegate gasses have a smoother exit path with the bellmouth or twin-dump than with the regular. The theory is there is more power with smoother exhaust flow.
03-05-2004, 03:08 PM
#9
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Posts: n/a
Thanks for the help im only 17 so im a bit slower than others and im new to the turbo game and the boxer engine so bare with me im learing but of the 3 kinds of pipes which is suposed to be the best and who makes each kind, and which of those will connect with a cat back system.Thanks again
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