Will it fit 2017 kx250f

Should be no issue if you have a 1.5-2" inlet. I put on my 1983 honda 250 big red. It was really easy and looks nice.

Where do the springs attach to hold the muffler if your stock header uses a screw clamp to attach the factory muffler?

I'm not sure. I used it on my SxS. I cut the old muffler off and just used a muffler sealing compound and a muffler clamp. It is a straight through design and it is loud. I wouldn't use it on anything for the street cause it is likely to just get you pulled over and if you need an inspection sticker it will not pass.

What is the pipe size in the muffler and at the exit?

2" all the way through. Comes with downsize adapter to 1.5" for the inlet

Will this fit an 08 kx250f with an FMF mid-pipe and header pipe?

Yes, you will need to buy an adapter but they are cheap at any parts store.

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🏁 Upgrade your ride’s roar with universal power!

READY TO UPGRADE - Includes all necessary hardware for a seamless installation—get riding faster.
LIGHTWEIGHT DURABILITY - Weighing just 1.48kg, it adds minimal bulk while enhancing exhaust flow.
VERSATILE COMPATIBILITY - Ideal for dirt bikes, street bikes, scooters, ATVs, and quads—one muffler to rule them all.
UNIVERSAL FIT ZERO HASSLE - Slip-on design fits a wide range of 38-51mm exhaust pipes effortlessly.
PRECISION ENGINEERED LENGTH - At 390mm, it balances performance and compact style perfectly.

The Fast ProUniversal Hexagon Exhaust Muffler Pipe is a 390mm slip-on muffler designed to fit exhaust pipes between 38-51mm diameter. Lightweight at 1.48kg, it’s compatible with a broad range of two- and four-wheeled vehicles including scooters, dirt bikes, street bikes, ATVs, and quads. Sold with installation hardware, it offers a hassle-free upgrade to enhance your vehicle’s exhaust performance and style.

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Manufacturer	Fast Pro
Brand	Fast Pro
Package Dimensions	45.59 x 12.8 x 11.99 cm; 1.48 kg
Item model number	F17130008
Manufacturer Part Number	F17130008
Item Weight	1.48 Kilograms

Fast ProUniversal 1.5-2" Inlet Hexagon Exhaust Muffler Pipe Slip On Scooter Motorcycle ATV Dirt Street Bike

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