I want to update about pipes..
I was running my virtus.21 with the 9901ss/41032, good power, good mileage, good bottom and top and temps at 284F.
The past weekend I runned the 9886ss which I cerakoted with the 41031 manifold. I tunned with the 9901ss/41032 runned it and swapped it on site with the 9886ss/41031.. The difference was massive.. I also richened tha hsn about 4 hours and had more power with temps at 260F.
I runned those compos and both of the seem close in performance but never back to back with each other.
Performance wise 9886ss/41031 is a bomb, temps are better but mileage is worse than 9901ss/41032 but I don't really care about mileage so I am keeping the 9886ss/41031 for now on on every nova I run..