Exhaust Sounds

[JST]

I AM LOOKING INTO GETTING A NEW PIPE AND HAVE QUESTIONS REGAURDING HOW LOUD EACH PIPE IS,HMF SLIP ON,HMF FULL SYSTEM,TC,FMF TI,AND WILEYCO.IF POSSIBLE HOW MANY DECIBLES OR PLEASE COMPARE THEM TO A HMF SLIP ON WHICH IS WHAT I CURRENTLY HAVE