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Originally Posted by REPTYL
When I had the side pipes running I did a little test down the south eastern freeway.
Held the sound meter at my right ear while doing 100 k/ph.
109db at my ear!!!!!!
Let’s just say I started wearing earplugs while driving the Cobra long distances.
The exhaust now exits out the back of the car and I must say it's much nicer that way.
When I had the car engineered for the first time it blew 102db at the tip.
It had to be 92db 4 inches from the tip at 45 degrees at 2/3 max revs.
To get it to that I ran duel inch and five eighths exhaust with 2 commodore mufflers, four resonators and two and a half metres of chook wire jammed up the tail pipes.
From memory it blew 98db with out the chook wire. (max revs dropped to 4 grand when the wire was added).
What ever it takes, right.  |
Ha Ha my car was so muffled through the temporary 2 into 1 system that the back pressure had to be removed with a vacuum cleaner before it would start. It only just passed because it made high pitched whistling noises that upset the decibel meter. A larger diameter pipe would have done the job !