best exhaust for raptor 660

I've got a Yoshimura RS-3 on my 660. It's louder than stock but not deafening, and I didn't have to rejet until I also did the air box mod. Fitment was perfect. Just make sure you get the right year—mine's an '04 and the header flange was slightly different.

Pro Circuit T-4 is popular and gives a deep tone. I ran one for two years without any jetting changes. It's a slip-on so easy install. Only downside is the packing needs replacing every season if you ride hard.

If you're on a tighter budget, the HMF Bill's Pipe is a great choice. I got mine used for $250. Sounds mean but can get loud on the pipe. You might need to adjust the pilot screw if it pops on decel.

I'd avoid the cheap eBay exhausts—they don't last and the sound is terrible. Stick with known brands. Also check if the midpipe has a spark arrestor if you ride on public trails.

Full system? I went with a Big Gun Evo. It actually boosted low-end torque a bit. Jetting was mandatory; I used a DynoJet kit and opened the air box. Install is straightforward but take your time with the header bolts.

I run a FMF Powercore 4. Good quality, not too loud. No jetting needed on my '05. But I've heard earlier years might need a richer needle. Confirm your model year before buying.

Don't forget the gasket between the header and muffler. I reused the old one and it leaked. Costs like $10 to replace. Also check the mounting bracket—some aftermarket pipes use a different bolt pattern.

I've seen a few guys get the Two Brothers Racing exhaust. Looks cool but I've heard it's extremely loud. If you ride in quiet residential areas, you might get complaints.

If you want the best all-around performance, spend a little more on a full system like the DASA. It's pricey but the power gain is noticeable. You'll definitely need to rejet and possibly an intake.

I swapped a stock exhaust off a 700 Raptor onto my 660 and it actually sounded decent and was cheap. Not a real upgrade but if you're on a budget, check marketplace.

Whatever you get, make sure it has a USFS-approved spark arrestor. Rangers will check. I got a ticket at Hatfield-McCoy for a non-screened pipe. Lesson learned.

I've had the HMF silent series for 2 years. It's quiet but still flows well. No jetting needed. Not the best for max power but great for sneaking through the woods.

If you do a full system, pay attention to the header length. Some short headers shift power to the top end and hurt low end. For trails, you want a longer header.

I bought a used white brothers pipe and it cracked after a year. Not all used deals are good. Newer materials are better. I'd go with a new FMF or Yoshi for reliability.

Check if the exhaust comes with a removable baffle. A lot of us like to run with the baffle out for louder rides, then put it back for inspections. Just don't forget to repack frequently.

Also consider the weight. The stock exhaust is heavy. Dropping 4-5 lbs helps the handling. But that might not matter if you're just trail riding.

I put a cheap DG exhaust on my 660 and it snapped off at the weld. Spend the money once. Save up if you have to. Now I have a Yoshi and it's solid.

If you're not mechanically inclined, stick to a slip-on. Full systems require removing the rear shock on some models to get the header out. It's a pain.

One more tip: when you install, use anti-seize on the bolts. The aluminum head can corrode. I had to drill out two broken studs from a previous owner's hack job. Not fun.

I run a HMF Optimizer fuel controller with aftermarket exhaust. It makes tuning easy. You don't need it for a slip-on but with a full system, it's worth it for air/fuel ratio.