There are some weak areas in the SA/FB rear ends, but unless your making ALOT of power and horrable at sliding the car around then you should not have an issue.
The only othere thing that makes a 7 hard to drift is the short wheelbase as the car is alot happier to swap ends (spin) when pused. But this can be overcome with experance.
As for the exploding muffler, well thats a first in my books. But as black rocket said, its possible that debris has gotten clogged in the muffler from the cat converted and cause ALOT of backpressure and blown out the muffler. Or mabe a bomb in the exhaust ????
:P
Good luck with getting that issue resolved.
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