Quote:
Originally Posted by Montauk17
A simple muffler swap give your very little to no hp increase. You will see the most hp increase with mandrel bent exhaust system. The smoother and least amount of bends in the exhaust pipe has more to do with hp increase. I managed a meineke car care for 3 years and this was a huge debate. Most people think the bigger the pipe and least about of restriction equals more hp. That is far away from the truth on a stock or lightly modded engine. Only time that is true is on high hp engines that need the extra exhaust flow to allow the engine to be efficient and make the hp. In your case with no cats and glass packs you are actully looseing low end torque and hp. Stock engines need the backpressure that comes from cats and a muffler to run at peak hp and tourque.
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You hit it on the head, especially with the last statement. You will lose hp and fuel economy if it isn't set up right.