Is there any benefit to a dual exhaust vs a single other than sound? Also I only have a tuner, intake, and delete pipe, would a 4" work fine or go with a 5"?
All of it will depend on preference in sound.
I had a straight 4" and then put a muffler on it to tone it down some, straight it was LOUD!!!
It is still loud but at least I can drive by a cop pulling my trailer and they dont stare.
5" will be deeper, but performance wise no difference.
I have the 4" Flo-Pro with muffler.
It has a nice sound at idle, sounds good when truck is started.
I don't know what it sounds like outside, never let anybody else drive it.
I can't hear the exhaust over the wind noise with windows down either.
However, the most important part is...NO DRONE.
I really like it.
Nice pipes, love the clamps.
Your down pipe is only about 3.5" so anything bigger than that won't gain you much for performance. The bigger pipe sounds a bit different but that can be done with a large tip also.
I have a 4" in my cclb and had a 5" on my ecsb... I'd go 4" downpipe with 5" pipe... The 5" sounds much deeper and has a rumble at idle compared to the hiss or the 4". If the 5" is to much for you then add a muffler down the road, but I'd definitely go with a 5"
Before I did my stack I had str8 4" all the way out with a 7" tip. My buddy ran 5" all the way and I gave him my 7" tip. I think they sounded the same. I think the tip made the sound.
4 inch will be louder with more whistle. Straight pipe no muff. 5 inch looks the best and still sounds great. I'd get a 4 inch downpipe and 5 inch straight pipe. Brand doesn't matter as long as its stainless steel.