White Brothers MX-4 slip on

[stumpleg]

I am wondering if anybody has been around one of these. I am wanting to know what kind of decibals it has, and how it stands up to GNCC standards. I have an 06 450 with the HRC kit. I am just thinking I will buy a slip on, after seeing how big the headpipe is. If anybody has any other opinions, lets hear your input. Thanks in advance.

[fmfhonda250r]

I have a hrc kit with a mx 4 slip on and a mod quad foam air filter kit and my trx runs great and pulls great every where. It is alot quiter than my duncan on my yfz

[450robot]

i dont think an mx4 will be alowd in gncc, seeing as it doesnt have a spark arrestor