pit bike build

Hey guys just wanting some knowledge on what pipe I should be looking for my pit bike, also I pulled off the muffler tonight and found out it has an adapter and wondering if I can take it out of the muffler or if it’s welded in before I destroy it. Pictures below of my bike.

Hi i just rebuilt my Chinese pit bike ground up and am looking for a good place to rip. as anyone got any suggestions?

I picked up another cheap roller the other day, it's a BSE / Foxico TTR style bike with a dead Lifan 150 Apparently the engine has gearbox problem's. Since i'm not that comfortable on the Braaap, i thought i might swap the 190 into this bike. My old Atomik Fuse felt perfect for me, where ever...

Hey guys, So I have this bitsa bike we picked up on the weekend, it's a 90cc semi auto for our 10 year old to step up from his quad. We wanna get some new plastics for it, and the bike has been changed out from its original frame, so not sure what this frame is and whether the...