[M 4 FUN]

My friend and i dynoed our cars this summer. Both run Bootmod stage 2 but my friend has the E30 map and catless downpipes. I run 20% torque reduction and stock downpipes.
On the Dynojet i got 498 whp and my friend got 514 so the difference is not big between stock downpipes and decatted which tells me that there is very little restriction in the stock downpipes considering my friend ran a E30 map too. There is even dynoruns that shows higher hp numbers with stock downpipes compared to catless ones.