Level 1:
Valvetronic Designs valved rear section
For those looking for a little bit more sound and the ability to control their sound level on the fly the best way to go is with the Valvetronic designs valved axle back. This is roughly 30% louder than stock. If someone is looking for a subtle bump in sound quality this is the best way to go. Having the valve open gives you nice pops and having the valves closed keeps that stock sound level
Sound Clip:
https://www.instagram.com/p/B2ueAmfppLf/
Level 2:
Valvetronic Designs valved rear section + resonator delete
Level two is when one has the valved rear section but want a bit more aggression. With the resonator deleted you get more pops and more aggression on the downshifts. With the Zf8 speed transmission, upshifts and downshifts are met with pops and farts. Deleting the resonator will increase the sound level by roughly 10% more sound than level one
Sound Clip:
https://www.instagram.com/p/B2h5-xRJiPt/
Level 3
Valvetronic Designs valved rear section + catted downpipe
Adding a catted downpipe is a great way to see big power gains as well as sound gains. It’s vital to have a valved rear section to be able to control when the car is loud and quiet.
Sound Clip:
https://www.youtube.com/watch?v=Y9MgB4O66Q4&t=474s
Level 4
Valvetronic Designs valved rear section + resonator delete + catted downpipe
For more sound, just as in level 2, deleting the resonator is a great way to get more pops and snaps without affecting drivability. As the resonator is a free-flowing section of the exhaust deleting it only makes the setup 10-20% louder than with it still in place
Level 5
Valvetronic Designs valved rear section + free flow downpipe
When fully free flow, the exhaust is extremely aggressive. With valve open be prepared for snaps on the shifts and pure sound on acceleration pulls.
Sound Clip:
https://www.instagram.com/p/B9IMx5Rp1JV/
Level 6
Valvetronic Designs valved rear section + resonator delete + free flow downpipe
Level six is the last and most aggressive level for the F chassis BMWs. This is a complete straight pipe and having valves is vital. With no restriction the exhaust tone is very motorsport, extremely loud and very aggressive. For those who want the most aggressive sound possible going and free flow and removing resonators and mufflers will get you this raw sound experience. With this setup be prepared to see flames with a proper tune.
Sound Clip: