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Muffler Question
A friend on mine is considering buying a 96 Metro. He will have to buy a muffler for it as soon as he buys it(assuming he does). I told him a muffler with smaller diameter inlet and outlet pipes would benefit his FE. His dad disagrees with me. So I need to know who is right. So I did some reading to find out the answer. This is my case for why it will benefit and if nothing else not hurt FE (remember he has to get a muffler of some sort anyway). 1.) Larger diameter pipes are to increase HP and high end torque. They accomplish this in large part by allowing air to flow more freely and efficiently. The more air flowing through the more gas used. To maintain proper air/fuel ratios. So wouldnt smaller pipes have the opposite effect? 2.) More restriction increases low-end torque. Which would allow you to shift into higher gears at lower RPMs. Obviously higher gears get better MPGs. 3.) The third reason I think it may help is because of back pressure. Back pressure would not allow all of the exhaust air out of the engine and therefore not allow as much new fresh air (along with new fresh fuel) into the engine. This is where i suspect you would lose some HP but also burn les fuel. 4.) My last point is more of a question but it seems to me that the more efficient cars have smaller exhaust. I know that part of that is due to smaller engines. However I am refering to differences in the same model. Is that correct? Well please let me know how you guys weigh in on this. We are most likely going to check out that metro sometime today. Thanks!
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