Hey, should I get FMF or Graydon Proline exhaust system for my Raptor? does anyone know the HP gains with these pipes, and does anyone know maybe the Decible levels, is one louder than the other, and are their spark arresters you can get with them? thanks

 

The FMF is not a serious pipe like the CT, Gereydon, Big Gun, or Sparks. I would go with one of the afore mentioned pipes. Any of them with propper jetting will be within 1 hp form another. Pretty much any pipe out there has a optional spark arrestor. And if the pipe is gonna make HP then it is gonna be loud

 

I have the FMF power core2sq slip-on. I've had my Raptor since the second week of Sept. FMF and Big Gun were the only ones offering a pipe at that time and Big Gun's were on back order. Since having the FMF for approx 6 months, DON'T BUY FMF. Mine is already falling apart, looks terrible and as expected, power is minimal for a slip-on. It does help the mid and for what I was looking for, throttle response. I am now waiting to see what companys will come out with. CT is saying huge numbers, as is Sparks and TC. I'm going to wait for about 3 more months. By then I will have my high comp piston, cam and head ported. Then and only then will I invest in a new "complete exhaust syst". One thing to watch for, if you plan to modify any internal engine components, ex: high comp piston, cam, head porting, etc. You'll want to make sure the head pipes that come with your exh syst are a larger diameter than stock. This will help accomodate any internal engine mods.
Sorry to ramble on, just trying to help!