You can. But you will more than likely notice a performance difference in your power.
The answer would be "No, you don't have to". If you installed exhaust headers to improve performance then you might consider if your current exhaust system compliments the headers. Headers are designed to help evacuate exhaust gases and minimize back pressure. If an engine has exhaust headers that collect into a small single muffler and pipe then the effort is somewhat defeated. BUT, if the headers are installed for the "cool factor", and there is nothing wrong with that, then go ahead and use the stock pipes or as much as you can.
I guess your talking about exhaust headers. They allow the exhaust gases to get out of the engine in a even manner and faster for less back pressure and better performance.
Yes you can use headers in Excel. You can also use footers. Like in any kind of printed document, there is a margin area in which headers and footers can be used.
yes
Headers help to maximize exhaust flow which allows your engine to run more smoothly and use less power per stroke. Because of this headers can improve fuel economy but the change is very small.
Don't do it.
For the best performance, I like to use premium unleaded (91 octane). This seems to maximize engine performance on the trails.
I use 87, the GXE isn't a high performance car so no need to pay more for gas
The engine will have to work harder because of poor performance so the answer is yes.
what kind of headers do i use when installling a 72 olds 350 rocket into a 85 olds cutlas supreme ? long tube or short tube headers
yes only use what the car recommends. anything less and the engine will knock, anything more and you will only be wasting money, high performance gas only works with high performance engines.