I have a mild built 400 with a comp cam and edelbrock manifold and carb. has long tubes and i was thinking about running 3 inch with an x pipe topped off with some flowmaster super 44s but wasn't sure if the 3 inch would be to big.Should i stick with 2.5? Denfinatly NO glasspacks. Any suggestions on size.

 

Stick with 2.5-inch tubing. A 3-inch system will garner little benefit unless your engine sees more than 5500 RPM on a regular basis.

Need a tubing kit? Hit up Speedway Motors.. they have a 2.5-inch system for around $140.

 

Bigger isn't always better, you eventually reach a point of diminishing returns, and in this case 3" is just a little too big.

2.5" piping achieves a happy medium between decreasing backpressure while at the same time promoting exhaust velocity and scavenging.

 

Thanks for the info guys. im stickin with the 2.5

 

Another vote for the 2.5" pipes. Also I like the 44s as well. I run a pair of super 10s now and I love em!