How much better are RHS’ LS7 cylinder heads than the stock LS7 castings? We bolt them to a hot 451ci LSX to find out. Check out this install.

To test the durability of the engine, the team ran it on their dyno flat out at over 7,000 rpm for 5 minutes straight—repeating the test 12 times.

We put the stock BMW G80 M3 Competition on the dyno to see how much power it actually produces. Does it live up to BMW’s claimed figures, or is there more hidden potential? Watch the full test ...