hey how much do egts usually lower going from 3 inch strait piped exaust to a 4 inch strait piped exaust?

 

Not a whole lot.

 

noticed a huge difference when I went to five from 3.

 

at least a couple hundred degrees.

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the sound difference is priceless

 

3" straight pipe cracks when you snap the throttle.
4" straight pipe has an angry sound when you snap it.
5" straight pipe bellows when you snap the throttle.

If I had it to do over again I would have stayed with the 4" as the 5" costs me fuel milage when the weather turns cold in the Winter.You do not need anything over 4" to make power with and the 5' is only mainly used for the twins equipped trucks.

 

i got 3 inch straight pipe now but guna up grade to 4 inch stainless straight pipe.
guna install my pyro first to see how much egts drop. the 3 inch is kinda quite anyway.