i got a 91 ls crx and i just did my exhaust 3 weeks ago dc headers all the way back to a fart can. no cat or anything. today i got pulled over for modfied exhaust 250 he said it too loud,f**k state troopers. i was wonder if install my cat and a stock muffler will lose power at all or still be the same. currently 2.25 all the way back.