Have a quick question guys. Currently i have a catback and a TP, will my car run leaner or richer when i install the downpipe? Need to know so i can get my car retuned and dont want to take any chances of running lean. Thanks

 

car will get richer

 

Yeah, at least, mine did.. course I have a catdelete too, and that supposedly makes it a lot richer as well... so it could just be that