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Old 05-27-2009, 09:41 AM   #126
STiLTD174
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Two questions?

1- So if my mechanic uses the plug in to read the code for an inspection (after DP install) I will pass right??

2- How much will a catless DP change the exhaust noise of the car?
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Old 11-04-2009, 03:34 AM   #127
TheDafMaster
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What is how how do you prevent boost spike?
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Old 02-08-2010, 12:36 AM   #128
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i have an 05 wrx, i am planning to run a catless up pipe and catless downpipe. how long is it safe to run like that with out a tune? Also, i am going with the invidia divorsed, will i need any mods with the 02 sensor or run a egt resistor? thanks alot!

Last edited by bryantkalagian; 02-08-2010 at 01:04 AM.
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Old 02-10-2010, 01:23 AM   #129
myWRXisyellow
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this might be a dumb ? but idk. if i buy a 3in dp will it hook up stock to 03wrx or do i need to get 3in pipe? and if it installs to stock will the hp be the same or will it gain still?

thanks for the info also. helped a lot.
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Old 04-06-2010, 04:11 AM   #130
AnointedDrummer
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Will an Invidia dp that fits on an '06 STi fit on an '07 WRX? I looked and can't find it but really need to know ASAP. I'll keep looking, but if you know for sure, please post. Thanks much, sale pending.
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Old 04-08-2010, 04:06 PM   #131
alx8283
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ive heard that running a catless downpipe and up pipe combo will/can cause boost spiking...is there any truth here or do i have it all wrong?
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Old 04-08-2010, 04:30 PM   #132
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You heard dead wrong. Boost spikes can be aggravated by a catless downpipe...mainly in 2.5L cars, but the CAUSE is the wastegate on the turbo NOT the downpipe.
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Old 04-12-2010, 02:24 PM   #133
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sweet FAQ helped alot.
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Old 09-18-2010, 01:05 PM   #134
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Quote:
Originally Posted by myWRXisyellow View Post
this might be a dumb ? but idk. if i buy a 3in dp will it hook up stock to 03wrx or do i need to get 3in pipe? and if it installs to stock will the hp be the same or will it gain still?

thanks for the info also. helped a lot.

right now im running a invidia 3in with the stock catback, and it seems to run fine. i went to this from a full 3in tbe, and this seems to run smoother with the incresed back pressure. the dp is heat wrapped and im running a stage 2 ots map from cobb. i would recommend this for anyone looking for a quiet but powerfull setup.

i also had a question about the heatwrap. I only wrapped the bellmouth to the first bend and coated the whole thing it the silicone paint (not sure how much that really does?). but awayways sould i wrap the rest or just leave it alone for the wet colorado winters?
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Old 01-13-2011, 09:49 AM   #135
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sweet
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Old 01-13-2011, 12:56 PM   #136
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Thanks for the info.
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Old 02-19-2011, 09:46 PM   #137
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so let me get this straight? i can put a cat-less dp on my 02 with no tune without negative side effects?

also looked at the links with no success on the o2 fix?
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Old 02-19-2011, 09:57 PM   #138
McKenzie83
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Quote:
Originally Posted by Unabomber View Post
You heard dead wrong. Boost spikes can be aggravated by a catless downpipe...mainly in 2.5L cars, but the CAUSE is the wastegate on the turbo NOT the downpipe.
true that...only reason the dp plays a part is the lack of backpressure from a high flow cat...but it's still on the IWG thanks to the fact that EWG is the best way to go anyways...but yup, usually with a tune you can take care of it.
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Old 02-19-2011, 10:00 PM   #139
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Quote:
Originally Posted by Flat4orce View Post
right now im running a invidia 3in with the stock catback, and it seems to run fine. i went to this from a full 3in tbe, and this seems to run smoother with the incresed back pressure. the dp is heat wrapped and im running a stage 2 ots map from cobb. i would recommend this for anyone looking for a quiet but powerfull setup.

i also had a question about the heatwrap. I only wrapped the bellmouth to the first bend and coated the whole thing it the silicone paint (not sure how much that really does?). but awayways sould i wrap the rest or just leave it alone for the wet colorado winters?
I just wrapped my 3" dp as well...only to about 6" past the bend before it goes back towards the midpipe. I did this just to see how well it'll hold up to the weather. In the end I'll probably just get all the piping that is parallel with the ground coated ...if I wanna be a true d.i.k. and take it that far.
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Old 03-21-2011, 03:42 PM   #140
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are the DP's on the 08-10 the same as on the 2011?
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Old 03-21-2011, 03:44 PM   #141
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Quote:
Originally Posted by jhornik View Post
are the DP's on the 08-10 the same as on the 2011?
Yes, they are identical.
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Old 04-03-2011, 11:57 AM   #142
redsoxfan910
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I just bought an '04 wrx...I want to put a catless down pipe on it with an exhaust and I live in CT. Will I have to put the DP on it, get it tuned...then take it off again to get emissions tested? Then redo this process everytime? I 'm confused, and new as you can see..
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Old 05-08-2011, 11:33 AM   #143
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Found it

Last edited by jstepp5220; 05-08-2011 at 12:56 PM.
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Old 05-08-2011, 12:06 PM   #144
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You are asking a question that is answered in the Cobb Tuning documentation available for viewing and download from the Cobb website. You need to read it and not get the answer handed to you as it is CRITICALLY important to read 1000% of the documentation. If you still can't find the answer, call Cobb.
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Old 05-08-2011, 01:06 PM   #145
jstepp5220
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Yes I don't have a computer, and I can't download it from my phone going to the library tomorrow than
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Old 05-18-2011, 02:12 PM   #146
gian-carlo
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I know you talk about having to replace the bolts on an aftermarket uppipe, but nothing is said about the downpipe and exhaust. Do these bolts normally not break and hence can be reused most of the time?

GC
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Old 07-10-2011, 01:45 AM   #147
bittner07
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ok so i installed my catless dp today and my buddy is telling me that it is horrible to drive it without a tune is this true can i damage anything without getting a tune soon?
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Old 07-16-2011, 11:40 PM   #148
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Thanxx you
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Old 10-29-2011, 02:30 PM   #149
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I have a question, im new to nasioc and not sure where to post my question but if someone could helo me out it would be great. i have a 2009 subaru wrx, and im looking for a throttle body spacer. if anyone knows what brand and where i could get one id appreciate it! thanks.
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Old 11-12-2011, 06:02 PM   #150
BlackBeautysti
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Will putting downpipe will degtease ur mpg ?
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