It will gain about 2 to 3 horsepower when jetted
Yes it will i had a gytr 660r and put a raptor 700 motor on it
depending on models as they vary camshaft timing figures and exhausts but i have measured my 2008 wr250f on two dynos and it pulled 36rwhp on both with gytr exhaust tip and rejet....stock was 34
Its called by most a shorty...I bought one for my 07 R6 from yamaha. It is made by GYTR...
I wouldn't have thought exhaust end-can packing would significantly increase power output, or reduce back-pressure. That is normally dealt with by the tuned length of the pipe itself and overall diameter of the exhaust-can internals. Removing the packing will obviously make it noisier, reduce any heat build-up and possible reduce the weight, but only a little. Other than that I don't think there will be much in the way of performance enhancements to be gained. If you however remove the internal pipe work inside the exhaust-can and install a straight-through internal pipe, with custom packaging I would have thought this would give more impressive power gains. The first area for exhaust modifications on a modern bike should really be at the Catalyst end. This device reduces power output, increases weight and heat.
Looks likeyou got the wrong muffler or you need to modify it for fuel injection. The cables are for the fuel injection oxygen sensor; essential for engine management, performance, and minimizing emmissions.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern GYTR-----. That is, nine letter words with 1st letter G and 2nd letter Y and 3rd letter T and 4th letter R. In alphabetical order, they are: gytrashes