well today i through on my cats for the SLP X-pipe i had the races pipes in with the Borla stingers and after like a half-hour to about an hour my ears wuld start to hurt me from the sound so i figured since inspection was coming up for me i would throw on the cats and pass the inspection and also give me ears a break. the cats really quieted it down and now i can actually hear myself think in the car and not have my friends say "lets take my car yours is too loud" lol so im happy how its sounds now.. my question is what the break in period for the cats? theres brand new out of the box will they louden up a bit or not really be a noticable difference?

 

You probably won't notice. I installed SLP LT's with SLP catted X-pipe and never noticed a change from time of install. I've thought about trying o/r pipes to see if there was a difference in sound/performance.

BTW, try using some punctuation.

 

o my is there a difference between o/r x and catted, sounds like a different exhaust.. with the o/r once u get to 3k it absolutely screams.. but catted will do for now..