I was considering removing the cat converter on my 91 CRX b16, it currenly has a Greddy cat back and I was hoping to get a few extra hp. Here are the questions, how much louder could I expect it to be? Does the Civic and CRX use the same cat or test pipe length? What would be a good "test pipe" to go with?

Thanks in advance
Kirk R

 

just leave it. unless its clogged of course, in which case replace it with a stock cat. it will be louder and raspier, and dyno tests have proven you'll gain literally about 1hp by having no cat. course that was on a dohc-vtec b-series engine, so you can imagine the effect would be less on a d.

 

Thats interesting, anyone else heard of this? I have no reason to believe the facory cat is failing, but if it will only give 1 hp, its hardly worth the extra effort.

Kirk R

 

ya b16 straight pipes are raspy as hell and give no noticable hp gains. u might sound louder though haha

 

I agree with the other ones. An unclogged high flow cat helps eliminate rasp, quiets it down some, and keeps the smog guys happy. I dont have smog where I live, but it is still nice to have it there for the visual exhaust condition inspection.