should i bore out my cat. or no, will it make a difference in sound alot or performance.?? thank you( i have hks hiper exhaust).

if your worried about that just buy a hiflow cat

Restriction in exhaust=power loss but to a certian point also=torque. If you don't know just leave it alone.

why pay money, save money. drill it out. its easy as hell takes ten minutes no loss of money for a brand name.

thanks but will it make it alot louder or not??

yes it will make it louder just like a header will make it louder but the cat will not affect the sound as much as a header but to answer your question yes it will