Hello guys i own a stock b16a del sol.Today i put a test pipe and i wanted to know if my afr will be affected. Lean or rich? Thank you

 

Your actual motor AFR's should be unaffected. Your "sniffer test" AFR's will be seriously affected.

Ya know what else will be unaffected? Your power.

 

Yup no way you'll pass any emissionos test with it on.



Ya like 8whp y0 bcuz race car op keep on being a ricer....

 

Did you throw a CEL?
Does your state require emissions testing?

Out of curiosity, did you notice any performance or smoother gear shift changes?

 

Smoother gear shifts? From an exhaust components?

 

I actually live in Europe.We have emissions test which i failed before.Thats the reason i removed it. Without it the car seems to be better after 7k rpm. Noo shifts are not affected by a cat. =]

 

lol if you failed with an old cat, you're going to fail even worse with a test pipe.

 

I suggest you move to China.. they obviously don't give a **** about any type of emissions.
http://latimesphoto.files.wordpress....ina-smog10.jpg

 

Last year a (let's say..a non-certified) mechanic changed my timing belt, water pump, tensioner, cam seal, accessory belts, new oil + fliter, pcv valve and ripped out the cat screens all in the same day. Afterwards the car shifted much smoother and I attributed that to the lack of back pressure from gutting the cat. Is the new timing belt the reason for a smoother shift? As a side note it has deeper (IMO better) sound to the exhaust after the cat was gutted.

 

Nope, doesn't work that way. The rest of the tune-up may have made your car shift better, but the gutted cat didn't cause it.