Post by
joe603 »
https://forums.nicoclub.com/joe603-u34652.html
Thu May 25, 2006 4:18 am
Nissan did a very good job on the exhaust, which is why gains are limited when replacing from the converters-back. Unless you do a complete exhaust system (headers/strait pipes/aftermarket CAT back) you will not gain that much HP.
Doing the cheaper intake stuff first yields about the same as only doing just a CAT back, for a lot less cash. Now if you do everything at once, CAT a back and intake mods, that’s a different story as they work well together.
I've heard good things about using the spacer in combination with the Z-tube/charger, even without touching the exhaust. So, with all intake mods completed, you should see around 15HP, which is the same as a CAT back...