Hi guys,

I have d16y7 with d16z6 intake manifold and bought 421 header for it, but also knowing about back pressure. I want just not to drop with powerband.
and also I have more flowing fake jap style muffler at tha back. So will I gain power or lose power with upgraded intake and 421 header on non vtec d
series?

thanks!!

 

You won't really notice any difference in power. All your going to notice is a nicer looking motor with a louder exhaust. It'll make the motor sound like your making power but really maybe gaining a couple hp which is nothing.

 

Thanks a lot