Got a DC sports cat-back lil bit ago waiting to be put on (00' GSR) but the previous owner had someone "ghetto-weld" this cat so i cant remove it from the exhaust piping so i was thinking what i should do ..

could i just buy a used stock gsr cat and gut it out

or , buy a highflow cat

or , just get a test pipe / straight pipe ??? or any other ideas?

which would be the best bang for the buck???

any HELPFUL comments are welcome.. thanks for all the HELP!!!