...just found this and I can't use a computer for shit...
The output of the DanMoto header will not fit the Yoshi midpipe. DanMoto kind of went rogue and made their pipes .5-1mm off what the usual standards are. However, there is this company in England that will custom make any size adapter pipe for you for about $18 usd shipped.
For example, if you need an I.D. of 38mm and an O.D. of 50.8 they will make you a pipe that is 100mm long with the correct diameters on each end and it will even have the 'slits' on the end for proper tightening. It is 1 continuous pipe. It is not 2 pipes welded together, just 1 solid pipe. You can choose 1 end with slits, both with slits, or no slits at all. They do very good work and cheap!
OR you can put a reducer pipe in which looks like a cone. One end would be 50mm and it gradually decreases to about 32mm. If you did this then you would have to weld the 2 spring clips to the aftermarket header and the corresponding end of the midpipe. The cone would go in between these 2 with 2 springs pulling the midpipe and header together
ExhaustParksUK
Custom made link pipe
http://exhaustpartsuk.com/index.php?...oducts_id=3218
Cones & Reducers
http://exhaustpartsuk.com/index.php?...dex&cPath=1234
Is the Yoshi exhaust on now? Are you experiencing popping/backfires? If you just have the Yoshi slip-on you shouldn't need a FC although you would like it a lot. If you add a custom header to it then yah chances are you'll need the FC. All of the aftermarket headers I have seen are a larger diameter than the stock pipe which gives you less backpressure. I've noticed the 300 is very sensitive when it comes to aftermarket headers not so much with slip-ons though
After adding an aftermarket header that is of a larger internal diameter you are going to lose some backpressure. Because of this you will feel a loss of torque in your mid rpm range. Another reason an FC comes in handy. I've installed a lot of exhausts on my 300. My current header is 42mm I.D. and halfway down it opens up to 50mm with a final exit at the muffler of 80mm. I lost quite a bit of torque so I installed lower gears to get some of that umf back.
Oh and if you have the Yoshi slip-on and add the K&N then Yah (imo) you'll need a FC. If you have the Yoshi, an aftermarket header, and then add the K&N you'll definitely need the FC
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