Not your typical exhaust thread

[Seibert_JW]

I've been through thread after thread for exhaust on here... And I've yet tind the info I want... This isn't the typical "Will a HMF work" or "does a FMF sound good" nope. So here's what my dillema is.. I'm also subscribed to club700xx (for a friend) and a guy on there (5WOPE) did an exhaust mod to his that I want opinions on. He took a Two Bros shorty from an '07 GSXR 600 and put it on his bike and it looks and sounds amazing. I love the short pipes, they just make so much more sense. I completely understand and respect the SOS and noise factor... That's why I kept it stock when I lived in a subdivision, but now I live out in the sticks where I can ride as loud as I want without pissin anyone off.

Do you guys think it would be crazy to try to do that same pipe on a 400ex. Two Bros 07 GSXR 600 pipe on that motor. I think it would look and sound amazing. I understand I'll have to rejet (that'll be fun). I live at sea level (Delaware) so I plan on starting with a 170 main, 42 Pilot, and 3.5 turns out. Or if I can get a 450r carb for cheap I'll also be doing that. I'm currently running stock pipe/headers with UNI.

I'm really just asking you guys to assure me of my sanity (or lack thereof) because I came, I saw, I heard, and I wanna conquer. Hehehe. When I redid the gaskets on the top end, I ran her open headers and fell in love. Put on the stock pipe and died a little inside. The only pipe I would consider if for some reason this LITERALLY blows up in my face, is a 400ex model Pro circuit T4 or the 2 Bros M7. That's all I'm interested in. I know the sparks has great readings and the HMF is well known.. But I do what I want. ;P I would love to get my hands on a white bros tho... They sound LEGIT.

Here's a link to the 700xx:
http://www.club700xx.com/vb/showthread.php?t=400

... And the sound clip:
https://m.youtube.com/watch?v=5zwor1zhlHc

[400man]

http://i417.photobucket.com/albums/pp255/ky2stroker/Photo10231352_1_zps356914af.jpg (http://s417.photobucket.com/user/ky2stroker/media/Photo10231352_1_zps356914af.jpg.html)

http://i417.photobucket.com/albums/pp255/ky2stroker/Photo06201212_zps979ed008.jpg (http://s417.photobucket.com/user/ky2stroker/media/Photo06201212_zps979ed008.jpg.html)

http://i417.photobucket.com/albums/pp255/ky2stroker/Photo06050938_zps20fb13f8.jpg (http://s417.photobucket.com/user/ky2stroker/media/Photo06050938_zps20fb13f8.jpg.html)

heres some pics of my bike, I have a white bros R4 full exhaust and I shortened the silencer down. I love this exhaust. I don't have any sound clips, but I might be able to get some later.

as for the street bike exhaust.......if you have the tools and a welder I say go for it.

[JOHNDOE83]

Hell ya!!! looks good, I used a cut down white bros r4 that was hollowed out on my 440ex drag quad "worked and sounded amazing"

[JOHNDOE83]

And as long as the gxsr slipon fits the EX header stuff it will work just as good.

[MtnEX]

Here's my opinion on the subject...

If using the stock header, my experience has been it's a total PITA if the weather changes much in your area.

I say this because I've had this experience with the bigger core slip ons made for the 400EX. We have a 400 kid on our race team and I do the tuning on his bike. It's got an EHS lid, UNI filter, Stage 1 Hot Cam, stock header and bigger core slip on. It's a total PITA to keep in tune. Weather changes, it cuts up and I have to mess with jetting.

This also doesn't generate the kind of power you can get out of a full exhaust, nor the sound quality. Tick more power than stock, lot of noise, trashy sound usually.

[Seibert_JW]

I'm glad you commented MtnEX because I'm by the East Coast and the weather here's quite bipolar. You think I should just stick with a full can? I don't mind jetting once... ONCE. But I don't wanna have I rejet 4 times a year. Do you think I would still have to rejet often with a stock cam and aftermarket header? I was thinking power/mega bomb only because those are really the only ones I've heard much about.

[Seibert_JW]

Also, personally I like the sound in the video I posted, but that's a 700 EFI engine... Not a carbbed air cooled 400 known for excessive valve tick. Lol

[KKiowaTJ]

Unless you have the slip on or can get it cheap to free, Stick with a traditional 400ex exhaust and cut it down. That vid only had idle and a blip of sound. Neither got me hot and bothered, If anything the guy wasted time and needs to rev the ******* up so the vid isn't a waste of space and time.

To each their own though. You would be money, time and tune once ahead if you went to the classifieds and bought a used slip on for a 400 and cut it down. 300cc difference, You will not get the same sound. Good luck either way

[Seibert_JW]

Thank you guys for your input, I appreciate it. The more I've thought about it, the more I think I'll regret it. I just really like the look of having a shorter larger pipe. Similar to the pipe on the Baja 700xx. But I realize the 300cc difference in design will be massive, however I love the look of it.. Haha. Thank you again so much for all your input!,

[400xtreme]

I have a question also. I just got a FMF power bomb header and the damn thing is tight against my motor where the bomb part of the header is. Will it hurt anything or should I just send it back?

[KKiowaTJ]

I have a question also. I just got a FMF power bomb header and the damn thing is tight against my motor where the bomb part of the header is. Will it hurt anything or should I just send it back?


If it's touching send it back, should be a small tolerance. If not it will vibrate a hole in the header and jug or crack either. It would also cause more motor temp with it tight/touching. IMO I'd send it back.

[Zakradu398]

Wait long enough and find a used TC shorty.

https://www.managerslogin.com/sites/folder597/site_images_system/user/DSC00371.JPG