tripletango
Well-known member
Here is a comment from the ST 1300 board. Has anyone who fitted a full exhaust system noticed the same result on FJRs?
Just installed the Staintune mufflers on my '05 ST. I did it not for the sound (which is nice) but to get rid of the 900 degree F catalysts which are right under the passenger footpegs on each side. No other bike has this dangerous level of heat so close to the rider's and passenger's feet. Now, after removing the stock mufflers and inspecting the heat markings on each one, it's clear that hot exhaust gasses were building up pressure just ahead of the catalysts and turning the pipes from gold to blue. That's real heat, just like you see on headpipes right at the engine connection. Since the exhaust gas has to pass through the fine honeycomb of the "cat" before entering the muffler, it builds up heat right there. The engine is forced to push the gas through the cat and the pressure and heat evidence is right on the pipe. Here's a photo of the underside of the stock muffler assembly. Notice the dark heat marking ahead of the cat. Buy the time the gasses get to the polished muffler body they've already cooled down noticeably, and the silver stainless steel shows it. Feet hot? Legs hot? Burned your skin bumping into those cats? This is why. Since installing the Staintune mufflers the bike seems to accelerate better. Whether it's the 20 lb weight reduction or the better exhaust flow is undetermined, but the improvement is noticeable. But the best part is the elimination of the heat source right under my feet and my passenger's feet. Also there is no cat bulge on each side waiting to burn my legs. Gotta like that.
Just installed the Staintune mufflers on my '05 ST. I did it not for the sound (which is nice) but to get rid of the 900 degree F catalysts which are right under the passenger footpegs on each side. No other bike has this dangerous level of heat so close to the rider's and passenger's feet. Now, after removing the stock mufflers and inspecting the heat markings on each one, it's clear that hot exhaust gasses were building up pressure just ahead of the catalysts and turning the pipes from gold to blue. That's real heat, just like you see on headpipes right at the engine connection. Since the exhaust gas has to pass through the fine honeycomb of the "cat" before entering the muffler, it builds up heat right there. The engine is forced to push the gas through the cat and the pressure and heat evidence is right on the pipe. Here's a photo of the underside of the stock muffler assembly. Notice the dark heat marking ahead of the cat. Buy the time the gasses get to the polished muffler body they've already cooled down noticeably, and the silver stainless steel shows it. Feet hot? Legs hot? Burned your skin bumping into those cats? This is why. Since installing the Staintune mufflers the bike seems to accelerate better. Whether it's the 20 lb weight reduction or the better exhaust flow is undetermined, but the improvement is noticeable. But the best part is the elimination of the heat source right under my feet and my passenger's feet. Also there is no cat bulge on each side waiting to burn my legs. Gotta like that.
