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its easy to confuse noise with power.
the manifold is the most restrictive part on the entire system.
It is so dire that it is believed that mgr altered to cam timing because of the issues the manifold/headers create, then had to mess about with vis to sort out the flat spots created by the many botched areas in the system design.
The engine should and could produce 300bhp - but thats another story.
My advice would be to fit a more standard back box rather than a straight through cherry bomb backbox.
A straight through pipe in place of the cherry bomb that replaced the cat would flow better for a start and with a typical backbox should be no less powerful than what you have at the mo.
It is very important to keep the pipe size the same all the way through, I don't know what bore the cherry bombs are, but you will be losing power if you have different size bores at various points along the way.
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