Stock Exhaust Mod???
#11
Thanks for the responses. Since I have a spare 250 muffler I will do some exploratory surgery. See where that leads me. I have been keeping an eye open for a 300 system in my area but no luck so far. Zomby woof I will keep your guy in mind over the next couple of weeks if this doesn't work out. Must ask, do you guys ever sleep? 4:27AM??? Shift work I hope. Thanks again, some very interesting reading.
#12
I have a muffler from the older KLX 250 model. It has the same numbers stamped on it, as the KLX 300 muffler. It's got the removable end cap as well.
I suspect the late model 250 muffler is the same, under that welded on end cap. Probably done to have a tamper proof, noise compliant unit.
Perhaps I'll drill a couple exploritory holes in the end cap of my stock 250 unit, at the 6 & 12 O'clock positions, and see if the end cap screws are visible behind it.
I suspect the late model 250 muffler is the same, under that welded on end cap. Probably done to have a tamper proof, noise compliant unit.
Perhaps I'll drill a couple exploritory holes in the end cap of my stock 250 unit, at the 6 & 12 O'clock positions, and see if the end cap screws are visible behind it.
#14
OK, so I have completed the surgery and I believe I have accomplished my goal of letting my 351 breath better while maintaining a stock appearance and only slightly changing the exhaust note while still not drawing any unwanted attention. What I have done is cut the end cap off, drilled out the first baffle above the existing tip, added a second and slightly larger pipe and welded them together. I drilled more holes in the last baffle only and re-welded the end cap. To hide the now 2 exits I welded a 1 1/4" tip on to the end cap. As you may notice in the photos, the second baffle has slots cut in it. I left this intact as I didn't want to change things too much. Seat of the pants tells me it worked well. Snappier acceleration and just slightly throatier sound. I think my jetting was a little rich before mod as Bill jetted it for snorkle removed and slip on installed.
#15
Short video clip of new & slightly improved (not much louder) exhaust note.
https://www.youtube.com/watch?v=MQ62...ature=youtu.be
https://www.youtube.com/watch?v=MQ62...ature=youtu.be
#16
OK, so I have completed the surgery and I believe I have accomplished my goal of letting my 351 breath better while maintaining a stock appearance and only slightly changing the exhaust note while still not drawing any unwanted attention. What I have done is cut the end cap off, drilled out the first baffle above the existing tip, added a second and slightly larger pipe and welded them together. I drilled more holes in the last baffle only and re-welded the end cap. To hide the now 2 exits I welded a 1 1/4" tip on to the end cap. As you may notice in the photos, the second baffle has slots cut in it. I left this intact as I didn't want to change things too much. Seat of the pants tells me it worked well. Snappier acceleration and just slightly throatier sound. I think my jetting was a little rich before mod as Bill jetted it for snorkle removed and slip on installed.
Thx Kevin
#17
Sure would work but I bet you would have to contend with lots of extra noise. My goal was to keep it quiet and just open up that pea-shooter to let it breathe a little better. Seems to have worked great but no Dyno to compare power. Butt Dyno says worked well.
#18
Man that looks good! My 2 bros is pretty darn loud, gets annoying... Did you do the welding yourself?
#19
Ride on
Brewster
#20
Would you happen to know, or any thoughts on, how a 300 header and exhaust, that's opened up at the end, would perform compared to a slip on? Would it be roughly the same flow or still much less than a slip on?