2000 cv exhaust leak or....

ok here is the problem I had the insides of my catalytic converters cut out because they were pluged as a temporary fix until I can get enough cash to buy new ones, but the problem is now fume gets inside the vehicle where I am sitting unless I roll up all the windows(mad headache ouch) but if I turn on the heater fume still gets in which leads me to think that there is a leak by the exhaust manifold, is there an easy way to check for leaks there, any tips? or the fumes from the tailpipe are so bad that they get somehow recirculated to the front and get in the car anyways....anyhelp greatly appreciated

ok here is the problem I had the insides of my catalytic converters cut out because they were pluged as a temporary fix until I can get enough cash to buy new ones, but the problem is now fume gets inside the vehicle where I am sitting unless I roll up all the windows(mad headache ouch) but if I turn on the heater fume still gets in which leads me to think that there is a leak by the exhaust manifold, is there an easy way to check for leaks there, any tips? or the fumes from the tailpipe are so bad that they get somehow recirculated to the front and get in the car anyways....anyhelp greatly appreciated

Did this problem just start immediately after you cut out the cat converters?

yes, but I thought maybe I messed up the installation and developed a leak somewere towards the front, because I could be cruising at 50-60mph and still get fumes in the car if windows down or heater on!! I am assuming if exhaust is only going out the tail pipe it shouldnt get in the car when I am going at that speed? or maybe it can..

try this have someone take a few rags and plug up the exhaust with the engine running it should make the leak sound louder and u should be able to find it