2nd time pulled over for exhaust

well this is the second time i got pulled over for a modified exhaust/muffler.... 8th time total between me and my brother driving... Never gotten one fix it ticket... what i need is some documentation that i can print out to bull shit the cop who says it is totally ILLEGAL to modify your exhaust....
1) a printout of the law which states exhaust modification is totally legal...
2) a carb sticker or some sort to vouch for my exhaust
3) a carb sticker or some sort to vouch for my intake

I doubt the cop is really gonna care for the make and brand of the exhaust and intake... so any help is greatly needed...

Stupid PoPo is cracking down on street races big time... i saw a r32 get pulled over and was GETTING TOWED !! the world has gone mad