I have a 94 civic ex and ordered a test pipe from ebay to replace my bad catalytic converter... but i wasnt sure the inlet and outlet size!!! the test pipe says its a 2.25" inlet and outlet.. will this work with my stock exhaust system or would i have to modify it to fit!?

 

I love the people who buy a part before doing research to see if it fits....

Lucky for you, you may need a slightly bigger donut gasket at the manifold outlet to test pipe inlet. The testpipe outlet should be fine bolting up.

 

sounds like a empty test pipe which serves no purpose besides replacing the cat with a empty bolt on pipe.

WHich in your case being it is a 94 will be perfectly fine and you will see 1-2 hp gain at most and no worries about the check engine light, it will not come on so no problemo.

 

Don't understand why no attempt was made to install it before worrying about install issues? This is why you don't buy near universal products. If you're worried about restriveness, don't. It's a Civic. It's already restrictive.

 

Thanks for the replies but yeah, i should have done my research first.. i still havent recieved it but just wanted to ask... and will i have to make a defouler for the o2 sensor? cuz i heard people have gotten the P0420 code and using a defouler to get rid of it. So the test pipe might work with my stock exhaust??

 

it should may need a bit of adjustment but nothing big. D or B engine ?

 

d16z6

 

OBD1 doesn't have a secondary 02 so no defouler needed. But you could have just punched out the stock cat for free.

 

+1

 

^^ already stated.