vsv6dude
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I'm getting them chopped tomorrow lol... easiest way for now.
I will keep that in mind for when I do it properly. Could I get some more info please?
Why would you chop out the mufflers, engine was designed to take into account the gas expansion at that point and various other points in the system.
You should replace factory with a straight thru like one at least like a Lukey Ultra Flow or similar and not just a straight pipe.
Some years ago 1999 I think Zoom Magazine did the great mufflers comparison on VR V6 3800 L series 2 with the 147kw engine.
They performed various combinations like:
1. No CAT
2. No centre muffler
3. No rear muffler
4. Various combinations with and without 1, 2 and 3 above.
5. The test were all done on the same vehicle and on the same dyno
6. The test were ramped up and down several times to reduce the scope for error and try to confirm the same curve overlay for each muffler
The outcome was:
a. engine lost power with No CAT, Centre Muffler and Rear Muffler
b. engine made most power when all 3 mufflers ie CAT centre and rear mufflers were retained
c. diagnosis was the heartbeat of the engine recognized the lost engine pulse when the mufflers were removed and was unable to compensate for it
d. removing the mufflers modified the effective pipe length and the time it took for the gases to hit atmosphere and this affected engine performance
e. solution was to find most freely flowing muffler that kept up gas velocity and keeping the mufflers in the OEM location which confirmed key points of the great exhaust write up on Street Commodores Forum by Aliens some years later
Rethink your strategy before you cut mufflers and the engine power of your vehicle.
Most likely you will stuff up your fuel economy as well.
I may not have explained it as well as it was written in the article but 90% of the jist of it is here as best as I can remember.
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