so my car has an astfer market upipe just to start and i just got a catless down pipe and i just put it in just to hear it then took it out for a small drive no check engin light and it ran great so i guess why question is do you think it may already have a tune.
if its not tuned would it still be ookay to drive for the two weeks till i don get it tuned if it needs it anything helps
The 2.0 L (02-05 WRX) engine is more likely to accept an aftermarket downpipe on the factory tune than the 2.5 L (06+ WRX) engine. I think the 2.5 is more likely to overboost because of the extra displacement and torque, so engine management is almost necessary to keep the CEL from coming on in that case. Either way, it's just a good idea to get some kind of tune to safely maximize the power. Did you at least reset your ecu after you installed it (by unplugging the battery for a couple minutes)?
02 works great with a bellmouth downpipe on the stock map. It's pig rich anyway so works well. Also gives you an extra PSI or so up top and some meaningful power increase. Tune will help even more though.
well its been on for a day and still no cel but i ask this question on a different fourm and they said it would mess up my motor really fast so now they have me worried
People did this for years before the AP even came out. The factory tune is pig rich and I would argue the car runs better with a bellmouth downpipe than it did from the factory. You're basically letting the wastegate work properly rather than self-restricting the boost by basically shoving the wastegate flow down the turbo's throat. The ECU in the earlier years has a big open/closed loop break point (fixable by tuning) and basically when you get into open loop, it's just going to dump fuel in anyway so there really isn't much to worry about here more than a factory pipe. I'm usually the first one to scream "tune after every mod!" but in this case, it's not needed. Would it help? Hell yes. The open loop/closed loop transition alone is worth engine management to fix.
Just to piggy back on what you said, I ran my 02' with uppipe and catless downpipe, no CELs or issue for well over a year. It is richly tuned from factory. The issue is...no issue. Just tune it when you get your AP and you will be fine. The sooner the better and when you get it tuned you will feel the difference and enjoy your ride that much more.
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