Went for a spin in a Harrop PD TVS 1.9L on a ls3 and all i can say is wow!
Kit is very similar to this one
https://www.youtube.com/watch?v=OgPcyafudfU&t=87s
It felt like a 10L Can AM V8!
Almost made my buddy wear his slurpee whilst drinking it when a straight in the road opened up, the response is near on instant - the Torque was the best bit, instant and violent right off the bat, surged in the midrange had to hold on whilst in peaked to redline quickly, really stuffs you in the seat. Felt like a roller coaster
And RJ MFG is going to be a 2.9L unit - holy sheeet our VQ's are going to be dripping with stonk!
I hope RJ MFG can really over-engineer the cooling system.
I voted Rotrex but stuff that PD all the way!