nikanoras

hello guys....
i have an ek4 with header/intake and i am thinking to replace my stock exhaust with ek9's...what do you think about this mod guys?? is that catback good enough as an aftermarket exhaust?? will i see gains from this replace?? thanks for your time..

nikanoras

no opinions?

97ej6dx

I would think you would feel a little gain but the CTR exahust is still pretty restrictive compared to a Spoon or Mugen but its made to meet the factory Decible standards with the most HP so if you are going to a quite killer then it would be good but if you want some nice sound i would get something aftermarket

nikanoras

can i use the jdm cat with the ek9 cat back at my ek4?? my car its eudm so it has two o2 sensors one of them at the cat..

raidacaipo

Well the reason why you have 2 o2 sensors is because its ob2a. It also depends on your motor. You could use the jdm cat however, if you want no check engine lights from your motor, then you could either get a jdm ecu to match your motor where it doesnt look for a secondary o2 sensor, or you can get a obd2 cat where a o2 sensor is used..

nikanoras

is it possible to make a drill at the jdm cat and install the O2 sensor?? will i have a problem if i dont inastall the second O2 sensor?? i will change the ecu with obd1 p30 with hondata..

ReVeNgEd-SoN

Yes you can do that, and if you don't install the 2nd O2 sensor the cars idle or air/fuel mixture will be off and it could ruin your performance. Your car won't be able to adjust it because the sensor isn't there

raidacaipo

Yes you can drill, however, I think it would be must easier to find a cat with an o2 bung on it already.

If you dont install the o2 sensor and if your ecu try and look for it, you will get a check engine light.. However, the check engine light is only telling you that your cat converter isnt working therefore its not really draining performance. In the other hand, if you remove the primary o2 sensor, then you may notice performance issues

If you change the ecu to obd1, then you wouldn't have to worry about the secondary o2 sensor because it wont look for it.. I say thats the best option so far. You dont need hondata either just a stock obd1 usdm or jdm ecu.

nikanoras

thanks btw 0EM ek9 cat-back is 2.5'' or 2.25''? my cheap ebay header is 2.25'' and i am thinking to replace it with a good aftermarket..you suggest 2.25'' or 2.5'' for my b16a?

nikanoras

bump

raidacaipo

2.25 is fine for an oem ek9 catback. However, if you go aftermarket find a 2.5" instead.