cat hunter
TY 4 Stroke Junkie
Would it make much difference if someone modified or changed the muffler on the 2011 APEX???
Maxout01
VIP Member
given all the electronics into the ex-up.. i'd say yes it would be an big issue to change them.
I dont think your going to have a real answer until people actually get to try the sled out and take them apart to modify.
I dont think your going to have a real answer until people actually get to try the sled out and take them apart to modify.
cat hunter
TY 4 Stroke Junkie
I read in old posts that this same type of exhaust was used on Yamaha bikes and a lot of guys had a lot of experience modifing it .I thought maybe some of these guys would shed some light on this subject!!! Thanks for your thoughts Maxout01. 
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actually, other than fuel milage, i would say no. i have a 2008 wr250x that came with the exup from factory. the gytr silencer i put on it eliminated the exup. it is slightly harder on gas than before but it still is tolerable and has a much nicer tone now. i think the exup was put on to cover emissions (at least that is the theory on the bike forumns).
cat hunter
TY 4 Stroke Junkie
I've run modified exhaust on my 3 sleds since 2003 and have grown fond of the sound and tomorrow is the deadline to order a new 2011!!! The money is not the problem and I love my 06 GT ,so I guess I'll have to s##t or get off the pot tomorrow!!! 
New mufflers will likely require no alterations.
EXUP is really a flapper valve that is modulated by the ECU at RPM's determined to be "optimum" for enhanced mid-range, so the bike marketing goes.
But most agree is it's probably there to allow a free flowing stock exhaust with the EXUP modulating the "loud" harmonic ranges so it will pass DOT sound emissions.
Removing the enire system will be a pain in the butt. I've done it on my bike, it requires a special block off plate (I made myself) and electronics alterations to avoid error codes (I used a resistor, but this is the more risky way - the safe way requires a $100 doo-dad.)
EXUP is really a flapper valve that is modulated by the ECU at RPM's determined to be "optimum" for enhanced mid-range, so the bike marketing goes.
But most agree is it's probably there to allow a free flowing stock exhaust with the EXUP modulating the "loud" harmonic ranges so it will pass DOT sound emissions.
Removing the enire system will be a pain in the butt. I've done it on my bike, it requires a special block off plate (I made myself) and electronics alterations to avoid error codes (I used a resistor, but this is the more risky way - the safe way requires a $100 doo-dad.)
cat hunter
TY 4 Stroke Junkie
Lots of unanswered qestions on the 2011 so I didn't order one today so I guess I'll wait and see what next winter brings!!! Thanks for the info on the exhaust and by the way Rino48 whats this 100$ do-dad ???cat hunter said:I've run modified exhaust on my 3 sleds since 2003 and have grown fond of the sound and tomorrow is the deadline to order a new 2011!!! The money is not the problem and I love my 06 GT ,so I guess I'll have to s##t or get off the pot tomorrow!!!
cat hunter
TY 4 Stroke Junkie
Rhino48 said:
