I did have to change out to a 180 super easy upgrade. I also changed my plugs to a performance set and added a k&n blackhawk. The tune from hemifever will require you to run premium fuel and cycle several tanks of fuel before then tune with be "finalized" I could tell a difference and decided...
I am running flowmaster 40s on my 2014 5.7 and absolutely love the sound. Not to loud when crushing around, but when you hammer down on it good lord the sound is nice. Running a k&n blackhawk intake with it as well. When both are sounding off damn it sounds mean!!
I have the diablo trinity 2 platinum running a tune from hemifever. So far the gains have been noticeable but not insane. I continue to do test runs and send the data over for adjustments so we will see. With the trinity 2 it is worth mentioning that I had to open a support case with diablo...
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