so p[purchased a decat 3inch   wanna get a sports cat welded in ,. but i see loads have no sensor hole.   am i right in thinking the sensor are before and after the cat?

 

i have a 2 piece decat kit. 

You are correct.

should just asked u dave!

 so ive come to buy my sports cat magnaflow version,. ive 2 options from what i see which would fit best 1 or 2?

 

cat 1

 

 

cat 2