i have a 3 inch stright pipe is that bad for the motor? should i look to put a cat on or not?

 

dude put a cat on your causing global warming..

 

^^^ then you will only be charged with animal abuse^ lol

 

ok i understan that im hurting the world lol but is my motor being hurt with no back pressure it came with the car

the car is a b20vtec cams header the whole head is worked clutch flywheel throttle body and soem other **** i cant think of right now

 

what mods does ur car have? like 10 second motor?

 

You're fine.

You won't see any HP gains from it b/c your exhaust isn't creating enough power out of such a small displacement that you need a wider exhaust to handle the back pressure. On the flipside, seeing as the piping before and after the test pipe is 2.25 (stock, I'm assuming) you'll maintain back pressure just fine.