> What is the best aftermarket free flow
> highest HP exhaust for my 75 280Z that I can
> Buy? Also, is there a filter charger kit for
> my car (like the K&N filter charger)?
It depends....Is your car stock? Do you have to keep the Cat??
If stock and without smog, best bang for buck is probably Motorsport 6into1 header (great low end torque) and their 2 1/2 inch exhaust. the hole setup is about $250 last I checked. If you have to keep your smog equipment, look into high flow cats, Headers and pipes that will still get you by the smog monsters untouched. Good luck