mga sir, newbie po on car modding.. actually ala pa talagang na gawang mod sa car...

question ko po, ok pa rin po ba na mag 4-2-1 tapos ung three way catalyst is connected pa rin? parang ganito..
(i mean is it still worth magheaders? plan ko gamitin lang ung existing CAT)



i'm getting confused kc if magpaheaders or not... kc ayaw ko na mawalan ng cat converter ung car...

2005 Nissan Sentra N16 GS A/T 1.6 QG16DE