Engine/Power - non turbo (All non turbo Imprezas) Who needs a turbo when you have 2500cc? Cams, intakes, exhausts, etc. The 2.2L and 1.8L Subies are cool too.

gutting 07 impreza 2.5i Cat?

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Old 10-22-2007 | 01:18 PM
  #16  
J-Chow's Avatar
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Car Info: 2006 Impreza 2.5i
i'm just gonna throw this question out there, so I don't have to start a new thread (sorry for vissionz),

but i'm currently runnning my custom exhaust with No Resonator. Do you guys run your exhausts with or without your resonators? I'm thinking of putting a magnaflow resonator back in place, to remove the raspiness of the exhaust tone.
Old 10-23-2007 | 11:56 AM
  #17  
enrique64's Avatar
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so mysterio are they unequal headers? or equal length headers? cant remmember?
Old 11-16-2007 | 06:19 PM
  #18  
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yo, sorry it took me so long to respond. they are equal length headers. the stocker's are equal also, but if you put both of them side by side it would be a no brainer on which one to go with.
Old 11-17-2007 | 01:13 AM
  #19  
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well rallitek hasnt sold them for along time..wonder if you can still get them?? or if you can find them some were else..hmm have you dino'd your car yet?
Old 11-17-2007 | 04:11 PM
  #20  
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You may be able to find someone selling theirs. You should call up rallitek and find out. No I haven't dynoed it yet. As soon as I get the pp6 and the crank pulley on I will. I'm hoping to get around 200-205 crank hp. we'll see.
Old 11-20-2007 | 02:48 AM
  #21  
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I'd say a rough estimate of adding a full exhaust + intake + pulley would possibly run you an extra 5-10hp at most.

So bolts on, i'd "Assume" you'd reach around 180hp crank.?
Add the pp6, and possibly add another 10hp to that?
I think you'd need to get the internals done up and whatnot to get it up to 200-205 crank hp, but what do I know hehehe, these are just random estimates :P

Good luck tho!
Old 11-20-2007 | 01:37 PM
  #22  
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What's the pp6?

Sorry, I'm new to the Subaru thing and trying to learn.

EDIT: Found it, but is it programmable or come pre-programmed?

Last edited by mopartodd; 11-20-2007 at 01:43 PM.
Old 11-20-2007 | 05:08 PM
  #23  
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Car Info: Impreza 2.5i
The pp6 stands for "perfect power 6" its a piggy back ecu tuner. here is a link if you want more info on it. http://www.rallitek.com/rapeecu.html

hope that helps. im planing on getting it. i talked to one of the guys from rallitek today and he said that with my current set up it will add 10 to 15 hp. not much power but i would like to get as much as i can lol
Old 11-20-2007 | 05:32 PM
  #24  
enrique64's Avatar
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Originally Posted by J-Chow
I'd say a rough estimate of adding a full exhaust + intake + pulley would possibly run you an extra 5-10hp at most.

So bolts on, i'd "Assume" you'd reach around 180hp crank.?
Add the pp6, and possibly add another 10hp to that?
I think you'd need to get the internals done up and whatnot to get it up to 200-205 crank hp, but what do I know hehehe, these are just random estimates :P

Good luck tho!


chow you really think that you only get 5...to 10 hp? i have a cai, catback and a pulley. the cai can add up to 5 hp mabey a lil more?. catback...at least 10 more hp. and the pulley frees up hp..8 to 9 hp. so if you look at thoses number i feel like you get more than you think..i agree that theres no way you can get 220 to 230 with all the bolt ons and the pp6. but i think with the set up you have there no reason why you or me cant get 200 to 205 hp i talked to one of the rallitek guys today and with the set up i have he said i could get 10 to 15 more hp with the pp6. but i guess the only really way to know for sure is to get my car dino'd. but you might be right..i just feel like i have gained alot more than 5 or 10 hp..thats all
Old 11-21-2007 | 07:55 AM
  #25  
zavier's Avatar
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Originally Posted by enrique64
chow you really think that you only get 5...to 10 hp? i have a cai, catback and a pulley. the cai can add up to 5 hp mabey a lil more?. catback...at least 10 more hp. and the pulley frees up hp..8 to 9 hp. so if you look at thoses number i feel like you get more than you think..i agree that theres no way you can get 220 to 230 with all the bolt ons and the pp6. but i think with the set up you have there no reason why you or me cant get 200 to 205 hp i talked to one of the rallitek guys today and with the set up i have he said i could get 10 to 15 more hp with the pp6. but i guess the only really way to know for sure is to get my car dino'd. but you might be right..i just feel like i have gained alot more than 5 or 10 hp..thats all
a well tuned exhaust system will net the most gains...just a CBE alone will do nothing. for the exhaust you'd need new headers that are proven to free up air flow. then the cats become an issue...they are the most restrictive part but the problem if you can't be legal without at least 1 (without 2 is stretching it in some states now-a-days). Add in a CBE and your exhaust should be complete...Then the intake will complete the system...

As for a pulley i don't put much faith in them. you'd free up more rotational mass going with lighter wheels and a flywheel over a pulley...so if you are trying to go that route with saving weight through rotation then i would look at your wheels first. those account for a LOT of weight, well that's cause there are 4 of them and they weight a lot (not just the rims but the whole wheel).

the PP6 is "nice" as a piggy back but, again, i wouldn't put to much faith in it. I would wait a bit long and see what comes out. These cars have only been out for...um...2yrs now(?) and have been neglected for a LONG time...give them time and don't rush it...
Old 11-22-2007 | 01:06 PM
  #26  
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i noticed a gain from my catback..sorry man but i really cant agree that you get no gains from a catback. i wouldn't have bought it if it wasn't going to do anything. i remember talking to you and even you told me that i would get more hp . i noticed the power.. alot The pulley was the cheapest mod i have done...yet it made a very noticeable diff in my revs. i also have lighter wheels. the only mod that i have done that i didnt notice a big diff..was my cai. even my pulley made a bigger diff. rallitek used to have equal length headers..but you told me not to get them haha. you said the ones we have are just fine. so thats why im a lil cuz i took your advice. so what cat should i get rid of that would help me get more hp?
Old 11-28-2007 | 07:30 AM
  #27  
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Originally Posted by enrique64
i noticed a gain from my catback..sorry man but i really cant agree that you get no gains from a catback. i wouldn't have bought it if it wasn't going to do anything. i remember talking to you and even you told me that i would get more hp . i noticed the power.. alot The pulley was the cheapest mod i have done...yet it made a very noticeable diff in my revs. i also have lighter wheels. the only mod that i have done that i didnt notice a big diff..was my cai. even my pulley made a bigger diff. rallitek used to have equal length headers..but you told me not to get them haha. you said the ones we have are just fine. so thats why im a lil cuz i took your advice. so what cat should i get rid of that would help me get more hp?
i guess i should re-word that a bit...

the CBE gains are not greater then the cost of the product...so in that regard they do nothing. the gains from lighter wheels, and dropping weight off the car in general, will net you more.

when we talked about what would be good/bad i don't remember you specifying you final outcome of what you wanted, you just asked me what was a good idea. the headers are not good unless you redo the whole exhaust system...headers alone with the stock cat, midpipe, and axleback are going to do little to nothing because the most restrictive part of the exhaust is the cat.

now i am not sure if rallitek's system removes both cats but if it does that might have been the reason i told you not to go with them...i am not one to do something to make a car illegal (i.e. not being CARB legal and all that jazz). also i don't know ralliteks headers, just like with obx/borla...i am not to familiar with their design. if they are just EL headers then they are no different then what you have. if they are actually tuned for flow that's a different story. a company can just make an EL header design that is "similar" to the stock one...but that doesn't mean it's an optimal design...that's the key part. i pretty much gave up looking for more "power" in the 2.5i becaue i realize it just doesn't have the potential without being expensive.

also remember...we are human, we do make mistakes

Last edited by zavier; 11-28-2007 at 07:36 AM.
Old 11-28-2007 | 09:03 AM
  #28  
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I'll do a trade if you want to run catless
Old 11-28-2007 | 03:45 PM
  #29  
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i get what your saying zavier. i to feel the same about my car. we all want more power but we will never get the wrx/sti power we want unless we have an *** ton of money. i got my rear sway and endlinks put on yesterday and i was talking to the guys at the subie shop about my car.. told them about some stuff that guys on this forum were doing. with going catless.. and they said its dumb to do. one its not legal. you wont gain much hp a few at most. cuz since are cars are n/a it wont help to open up the whole exhaust we need back pressure. they said its not worth dumping all my money into making it fast. so i might do a few more things to make the car handle better..but im done with the power. im going get a sti in a few years. but i will injoy my 2.5i tell then
Old 11-28-2007 | 07:27 PM
  #30  
AWDimprezaL's Avatar
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not to burst anyone's bubble, but piggybacks on subarus are worthless, the ecu will learn around them, subarus have very very sophistocated ecus , even dynapar on here tried a pp6 on his imprezal L for a turbo setup, it learned its way around it and gave him huge problems
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