@Iarado there was no significant difference between open and closed. The two runs you see I the graph..one is open and one is closed. The truck made 1wtq more with it closed which basically means nothing.
My cut out is before where the stock cat would be. It is about a foot after the header
Our 8” seams to be plenty capable with a nice Truetrac. Summit has that true trac for about 590$. Is that where you purchased?
I love that i5 sound under load!
So, are you saying you’re making near-300bTQ?!!
That’s awesome. Do you have any internal engine upgrades? ( cams, porting, compression ratio)