So I'm going with a single in dual out but I have some last questions.

The guy thats doin' it is gonna put a Flowmaster 40 Series on but I was thinking of goin' with a freeflow Magnaflow for the performance edge but I was wondering if I could cut the cat out without setting off the Check Engine light and if I did, would that be too much freeflow? And because the stock pipe is 2.5 and I'll be running duals out of the muffler..I should go with something a little smaller like 2.25 out of the muffler, right?

Thats kinda just what I plan on doing, I just wanna make sure that is all right. Thanks.

 

I have got 3" pipe all the way back with no cats and no mufflers...definitely loud...

 

Any help anyone? haha

And Druss, you're from Fairgrove? Wheres that at? Cause I'm from the mitten too.

 

No cutting the cat will not set off a CEL. And it is not to much freeflow. Stick to the stock pipe sizes.

 

If you are familiar with bay city or saginaw at all...im about 20-30 miles East of there...where abouts are you from?

 

Okay, I have an imco single inlet, dual outlet on my Dakota. The boss guy at the muffler shop tried telling me that thats what I'd pull out of a Flowmaster 40 series box, but I'm not an idiot and he gave me a deal on the rest of the exhaust so I took it. But the other guy there that always hooks me up would have not let that happen but he didnt wanna get fired haha. So a real Flowmaster would sound and perform better, right? Well, either way..this mufflers all right for now but I'm looking for something thats loud and rumbles good at idle, that growls on acceleration, and doesnt drone when I hit 1800-2500 rpm, and still keep the performance edge, if possible. Cause this one just isnt loud enough for my liking but I'm not one of those guys who wants an obnoxiously loud exhause, just something louder and meaner. Any suggestions? I know I'm picky but hey, my trucks my baby and more important than anything haha. Sad, I know.

And if a real Flowmaster 40 is all I need then just let me know. Thanks.

Oh and Druss, I'm not sure where those places are at, but I'm like 2 hours NW of Lansing.

 

Always run the stock sized exhaust size between the headers and muffler on a stock cam. You can always change your size 'after' the muffler. The size of your pipe has every bit to do with your back pressure. You can always gain exhaust efficency by using less restrictive cats and mufflers. Increasing the size of the pipe will change how the engine purges correctly and will change you torque range.

 

That doesn't always hold true Az93Dkota. The '92-93 5.2s had a larger diameter exhaust system than the '94-'95. Same engine, intake, cam, etc and had more advertised power. Dodge used the smaller exhaust to gain emissions control with the side effect of lower power. You can't just simply say the stock size exhaust is the best for any given engine, because its simply not true.

And yes, the size will greatly effect backpressure, but also the number of turns in the exhaust, how many restrictions are in the exhaust like mufflers, resonators, cats. All of those things effect back pressure.

The idea behind a good exhaust system is one that has just enough backpressure to not disrupt the flow of the intake, but not so much backpressure that it makes the engine work harder just to push out the exhaust.

It's impossible to understand every aspect of "the ideal" exhaust system. No amount of science, engineering, or math can design the perfect exhaust system because there is simply too much chaos in all the systems of an engine. The best anyone can do is know enough about exhaust to come up with a few good designs and try them out to find the best. The smallest, unpredictable change can have good or bad side effects on the engine.