Being I designed this custom exhaust back in 2008, 14 years ago, thought it was a good time to measure the exhaust sound in Dba
to see if anything had degraded in all that time

I used 3 test instruments

1. DB meter set to measure in Dba (shown on left side) was 1 1/2 feet from exhaust tip at a right angle
2. Output of that to a multi meter to record the sound in K Hertz (shown on right side)
3. OBD-II scanner

Weather was around 60 F degrees
Recording is from cold engine start to full warmed up
Since manual tranny, in neutral

Ran RPMs from idle which is at 850 RPMs due to CAM grind narrow LSA, to create more vacuum to 2,000 to 4,000 RPMs

My video could have been better as sun was to my back and did not know when I was at certain angles the Sun blocked out the multi
meter on the right side but, its recorded data is shown below

Idle cold/hot measured between 90-94 Dba, and at higher RPMs max recorded was 107 Dba
So in all these years nothing in the exhaust design or small mufflers as degraded


Crank your volume UP !