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Hey guys I have a couple of questions about downpipes. First is a non-cat pipe really louder than a catted? Second, after the mod does gas mileage increase, decrease? And Third whats about the hp difference between the two? Thanks everyone.
 

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Hey guys I have a couple of questions about downpipes. First is a non-cat pipe really louder than a catted? Second, after the mod does gas mileage increase, decrease? And Third whats about the hp difference between the two? Thanks everyone.
Yes, even a high flow cat will quiet things down quite a bit. My mileage stayed the same. If it changed it was minimal. To answer your third question, I need to ask you a few. What type of car, what year, and are you planning on using any form of Engine Management.

By the way, you should try out the search function. It's great for new people to the hobby.
 

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If you can go catless thats the way to go. There really will be no difference is gas mileage and the catless will have a little more rumble.
 
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