400ex fmf shorty exhaust

[yamahamx14]

i got an 02 400 wit a fmf titanium 4 exhaust on it. im thinkin about cuttin the pipe and makin it a shorty almost like a tc. im not to sure if this will loose or gain power though. im also not sure exactly how i would do it. any suggestions or opinions would help alot.
thanks

[CRich[814]]

loud.

[K&K440]

don't do it!!! nuttin to gain

[400eXr1d3rZ]

Originally posted by K&K440
don't do it!!! nuttin to gain

What are you talking about? Tons to gain.

[Franky G]

the only thing you will gain his that it sound lowder and a lil bit of botom end but that all not worth doing

I do it to all pipes. Short pipes look better. Your dbs will probably jump 5-10 dbs.

I never felt a gain in power but it sounds better to me and looks better.

I always cut 5" off.

Do you know how to make a shorty?

[yamahamx14]

Originally posted by slow
I do it to all pipes. Short pipes look better. Your dbs will probably jump 5-10 dbs.

I never felt a gain in power but it sounds better to me and looks better.

I always cut 5" off.

Do you know how to make a shorty?


yeah i know its gonna be mad loud. my friend said he knows how to do it but ill trust that kid as far as i could throw him so if you know how to do it and you could tell me that would be really helpful if i decide to do it

Originally posted by yamahamx14
yeah i know its gonna be mad loud. my friend said he knows how to do it but ill trust that kid as far as i could throw him so if you know how to do it and you could tell me that would be really helpful if i decide to do it

Take the core and packing out of the muffler.

Then cut the the muffler (only cut the back of the muffler not front or else the mounting spot will be off.).

Then how ever many inches you cut off your muffler you have to take the same amount of inches off the core to.

Then put it back to gether and you have a shorty.


(optional)
A thing i always did with my pipes was either replace the core with a solid 2" round pipe so it has no holes in it and then you can run no packing and rev a little faster. Or else i would wrap aluminum soda cans around the core and use a couple hose clamps to hold them tight.

http://i108.photobucket.com/albums/n26/getdrunk1990/4wheeler187.jpg
http://i108.photobucket.com/albums/n26/getdrunk1990/andy-2.jpg
http://i108.photobucket.com/albums/n26/getdrunk1990/0db63fa4.jpg

Junk pipes below that i did
http://i108.photobucket.com/albums/n26/getdrunk1990/9f855029.jpg

http://i108.photobucket.com/albums/n26/getdrunk1990/4wheeler071.jpg

http://i108.photobucket.com/albums/n26/getdrunk1990/aef5d569.jpg

[krt400ex]

that last pipe is off a 2-stroke!!!! what did it do??? like sound wise and powerwise???

[yamahamx14]

thanks slow, that helped me out a ton but when you say but the back of the pipe do you mean the side closer to the header of closer to the endcap?

[JOEX]

Originally posted by slow
...
(optional)
A thing i always did with my pipes was either replace the core with a solid 2" round pipe so it has no holes in it and then you can run no packing and rev a little faster. Or else i would wrap aluminum soda cans around the core and use a couple hose clamps to hold them tight.
...
If you do that then what's the point of using the silencer at all?

[krt400ex]

Originally posted by JOEX
If you do that then what's the point of using the silencer at all?


that is the same thing i was thinkin....it would be wicked loud. i tried mine without a silencer once and i couldn't even handle the noise at an idle

Originally posted by JOEX
If you do that then what's the point of using the silencer at all?

Really no reason. I just keep the silencer on for looks.

Originally posted by yamahamx14
thanks slow, that helped me out a ton but when you say but the back of the pipe do you mean the side closer to the header of closer to the endcap?

You cut closer to the endcap. If you cut the part closer to the header then it would still work right but the mounting points would be way off thats why you need to cut the part by the end cap.

Originally posted by krt400ex
that last pipe is off a 2-stroke!!!! what did it do??? like sound wise and powerwise???

It got major loud. It was a 50cc and it was louder than my quad. As for power it did get alot better over stock but i probably would have gained more by just buying a aftermarket exhaust. After that i removed the elec starter and from all the extra power and torque the clutch would go out ever 15-30 minuits.

[JOEX]

Originally posted by slow
....After that i removed the elec starter and from all the extra power and torque the clutch would go out ever 15-30 minuits.
:huh

[BigFish]

lmao....wow