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You have been conned . To blow sparks means that the exhaust gas temperature is excessive or that the cat converter is failing. Run the fault codes to ensure that the system is running as intended ( O2 and HO2s sensors) are ok and that the cat converter is working. BY the time the exhaust gas gets to the muffler the sparks would be out as the highest temperature is in the cat converter while the rest of the system is in a state if cooling down
It really depends on where the exhaust leak is. If it's in the piping or the muffler, then it won't be to bad fix with some over the counter stuff available at your local parts store. However, if the leak is in the manifold, then you could be lookin at replacing an exhaust manifold gasket. If it is in fact coming from the exhaust manifold, try tightening up the bolts. If work has been done on it before, there is a good chance one or two of the bolts could be loose or improperly torqued. The other thing to look for is a warped manifold, but that usually only occurs if the engine has gotten really hot. I hope this helps in some way.