| Author | Message | ||
     46champ |
My neighbor just bought a 09 1125cr with an aftermarket exhaust that I have no idea who made it. It is a complete system. The mufflers look like D&D XB mufflers only shorter and fatter. The header pipes are not stock the pipe outlets are rotated 90 degrees from stock. Anyone have an idea what he bought. I wish I could find an almost new bike with 2000 miles on it but then you have to be looking. | ||
| D_adams |
You'd have to post pics of it to get a decent answer on who made it. | ||
| Froggy |
 One of these? Free Spirits made them. | ||
| 46champ |
Thanks Froggy but no. The cans look like D&D cans but shorter and fatter whole thing painted flat black. | ||
| 99qk6 |
Dean Adams rt4?? | ||
| Zac4mac |
Major differences between Dean's and Free Spirits: Dean uses a n X-pipe so his is a 2-1-2 and sounds awesome. F.S. does not, theirs is a 2-2, no crossover and sounds HORRIBLE. FS cans are parallel, Dean's are not. IIRC, Dean's are also shorter/fatter cans. Z | ||
| D_adams |
Could have been a one-off prototype, Nick Hageman made at least one or two way back when. I know his were painted black. | ||
| Captjoe |
I think there is an X-pipe in the photo Froggy posted. In any case, not being exhaust savvy, what exactly is the purpose of an X or crossover pipe? I seem to remember reading something about keeping the pressure in the pipe so the sound waves don't reverberate back into the cylinder and slowly destroy it, but I'm not sure where I read that. Or does it just improve the sound? | ||
| Terrys1980 |
Yes the x-pipe balances the pulses or waves. It will also make the engine more efficient | ||
| Stevel |
This type exhaust has a rather narrow power band where the pipe's resonance sharply improves scavenging in one narrow engine speed range. If the fuel map is tuned accordingly, the torque curve will be markedly peaky. The addition of a crossover tube (X pipe) will reduce the peak and widen the torque curve, making the power band more broad. moving the position of the "x" pipe on the primary header pipe will shift the torque curve up when closer to the exhaust port and down when further away. The shape of torque curve can also be modified by changing the length of the intake stack in concert with the exhaust pipe tuning. Normally, you never want the exhaust to peak at the same speed range as the intake stack tune to avoid a sharp power peak. This is tricky stuff and it should be performed in concert to cam/valve timing as well. | ||
| Zac4mac |
I think you're right Cap'n. I've only seen/heard one and it was Free Spirits then IIRC, not Race Spirits. It was on one of the Ronin bikes.   | ||
| 99qk6 |
Man those are nice lookin it would be great to find one of these |
