such a basic question, but I'm wondering which I should get? I'm going to be getting a small16g soon and I want to get my exhaust and fuel mods on before getting it. Is 3" too much? What are the pro's and cons of both? One of my friends says the 3" is too much for the 16g and it won't hold boost in the higher rpm's b/c there won't be enough backpressure. Sorry for the stupid question, just want to get it figured out. Thanks a lot.
3" or 2.5" exhaust?
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ikickuintheball
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Make sure that if you are going to have a shop do your exhaust, it's mandrel bent. A 2.5" mandrel bent exhaust is better than 3" that isn't. That could be the reason why you got quoted for $600, because mandrel is more expensive. If you can find a shop with a mandrel bender that will do it for $400, go for it, but make sure you do your research first.
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Well I guess I am glad to see that people are searching! I think it's funny when posts get resurrected from 3-4 years ago. 
~Tim
~Tim
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A 3" exhaust does raise concern over boost creep if you haven't done any porting or if your wastegate is the stock size. 14Bs and 16G variants do usually experience boost creep with such a high flow exhaust. Port work is usually enough to eliminate the problem though. If you are truly going to stay with a 16G I don't think you are losing performance though with a 2.5" mandrel bent exhaust.
I dunno if it's a typo or not, but it's "mandrel bent". I just don't want you asking some exhaust shop for bandrel and the mechanic scratching his head.4G63tal said:
As far where to get it, no idea, since I just bought my system online and put it on myself.
im not going to ask the dealer for a mandrel bent exhaust i would know if it was when i see it and if its a performance one than most likely it would be i was just wondering where i could get one for that cheap but since u just got it online ill start searching thanks for your help though man laterSinaiTSi said:
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Check into the products made by Megan Racing on Ebay. They are cheap and I have yet to hear of any members being unhappy with the products.
ya i was thinking the 3" also because it puts out alot deeper sound than the 2.5" but than people started telling me that its know for boost creep and i dont need that but if theres a chance that, that might not happen than ill go with it. Do u have a 3" or is that just an opinion with no experience?
Ok I have seen first hand boost creep and bad on my 92 talon awd with n1 downpipe and catback no cat and on two other cars 91 awd with 3 inch downpipe and not cat and guy I sold my 92 to added 3 inch downpipe and catback no cat ,as I sold my n1 setup before he bought the car .The guy that bought my 92 blew it up with boost creep. the no cat thing I what does it I think the n1 I think is necked a bit but still creeps with no cat.At leat did on my car.So can't see how anyone stock setup can have no boost creep with no cat and big 3 inch setups.
I have seen this little gadget that is supposed to stop it for think like 30 bucks.
And how do I port out stuff to stop it on buddies car. Will 2g o2 help or not,evo 02..what do I port exactly is there any pics or exact info on what to do. He is getting past 17psi on his car with no boost controller hooked up! I did help him install a supra tt pump and afpr so he can better support the 17psi and told him only run premium fuel but we have to fix the creep and he wont' take off the 3inch.Maybe should have him cut in a high flow cat? or bullet type muffler would that help?
I have seen this little gadget that is supposed to stop it for think like 30 bucks.
And how do I port out stuff to stop it on buddies car. Will 2g o2 help or not,evo 02..what do I port exactly is there any pics or exact info on what to do. He is getting past 17psi on his car with no boost controller hooked up! I did help him install a supra tt pump and afpr so he can better support the 17psi and told him only run premium fuel but we have to fix the creep and he wont' take off the 3inch.Maybe should have him cut in a high flow cat? or bullet type muffler would that help?
http://www.vfaq.com/mods/porting-O2.html This is from the VFAQ on porting to help control boost creep. Just wondering, what type of manual boost controller do you have? My MBC keeps things under control with my stock exhaust on- and also running a straight 3" turbo back exhaust (tubular O2 housing). The problem I had with running such a big exhaust on the car was fuel cut above 12psi.
Since then I've rewired the fuel pump and I'm still waiting to get my FPR before I go ahead and swap in the 255lph fuel pump, so once those are taken care of, it should be interesting to see how the car runs when I put the exhaust back in.
P.S. Don't worry about posting in an old thread. It's not like they have an expiration date. Besides- if you started a new "2.5 or 3 inch exhaust" thread- all you would get would be "hit the search" replies.
Since then I've rewired the fuel pump and I'm still waiting to get my FPR before I go ahead and swap in the 255lph fuel pump, so once those are taken care of, it should be interesting to see how the car runs when I put the exhaust back in.
P.S. Don't worry about posting in an old thread. It's not like they have an expiration date. Besides- if you started a new "2.5 or 3 inch exhaust" thread- all you would get would be "hit the search" replies.
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So the 2G O2 housing does fit the first gen turbos right?
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The method or type of boost control has no effect on boost creep. It i the physical inability of the wastegate passage to bypass enough exhaust energy past the turbine wheel.
Your fuel mods will not have any effect on your fuel cut. Fuel cut is airflow indexed not a limitation on the fuel system.
Yes, it is a direct bolt on for any year DSM.
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