Aftermarket headers/extractors vr commodore

[Dj1crook]

ok so I've heard that from factory the VRs came with headers as stock. Would changing them to aftermarket ones do much to the sound and fuel economy or would it just be pouring money down the drain. All i want to do is have it sounding nice by also slapping on a hi flow cat and improve fuel economy by helping the engine to breathe easier

 

[losh1971]

Don't know about V8 but V6 just had cast manifolds. I have Pacies and didn't really notice much economy improvement on their own, even with a 2.5" cat back. Won't need hi flow cat on V6 unless pushing decent HP.

 

[keith reed]

I doubt very much that the vr came out with extractors. The effect that headers would have on fuel economy would be minimal and take many years to recoup the cost. Combined with a better exhaust a cam and a tune it might make a wee bit of difference to economy but again would take a lot longer to become cost effective. Most people myself included don't modify their cars with economy in mind. Nice if you can get it but too bad if you don't.

 

[Not_An_Abba_Fan]

VR V6 factory manifolds are pretty efficient on their own, the only need to change to extractors is if the manifolds are cracked. No real noticeable improvement in power or economy, measurable on a dyno but probably won't feel it. The only thing that really changes is noise. You will get a slight increase in torque, top end and cruising economy.