I currently have a 3 1/2" exhaust system (Banks) and wonder about what horsepower it will handle?
I'm getting ready to add a #10 plate and other things, which should get me to about 380 hp I'm guessing.
Yes, I'm upgrading the clutch too.
Will I need to go to 4" system to keep EGT down at this power level?
-Del

 

I would go to a 4" even if i wasnt putting a #10 in. 4" will have quicker spool up, Lower EGTs and also a great big rig sound.

 

3 1/2" is good to about 350rwhp. After that it becomes a restriction.

 

Thanks guys.
Good info.
I'll keep the #10 plate back a bit and should be okay with this exhaust til I get a bigger one.
-Del