What pipe and header are you guys running with this motor? I picked on up to slap in my NB48.4 but I’ve not even built the buggy yet let alone started breaking in the motor. Current choices I have on hand are a Protek 2090 and matching header, a novarossi 41021 header and a 9901 pipe and 2096 pipe.
I’ve no idea how the 2090 would react with a nova based motor but I’ve ran the 2096/41021 with a p5xl and liked it a lot and this is very similar.