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We’re keeping the Scorpion exhaust since its tips aligned perfectly, is lightweight, and sounds great as well.
 

This is the section 1 from Megan Racing we’ll be keeping. Those two resonators come in handy when we’ve got a goal of achieving these “off road” power levels at the least amount of expense to sound level and sound quality as possible.
 

Here’s the factory BMW section 2. Notice the resonator, which makes you think it would be an X-pipe upon first glance. Still, we don’t know how restrictive this might be inside. There’s one way to find out…
 

I borrowed Modified By KC’s bore scope to confirm that it is indeed just a normal, straight-through resonator. It does not appear to be restrictive, thank goodness.

A crossover pipe like the “H” seen above is used to provide an expansion area for exhaust pulses. Both sides of the H-pipe have exhaust pulses pushing against each other, stabilizing the stream of exhaust from then onward. This also helps to scavenge exhaust at low end and, thus, improves low-end torque. It may not look like a lot, and it really isn't more than a pipe between two pipes, but what it does is significant. Just ask BMW, which put it there. Or, better yet, let’s see the difference on the dyno! Let's go ring Modified by KC’s doorbell…

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