Pro Circuit make quality pipes that are bolt on torque and when jetted right, turn your Honda into a whole new bike.
I use their 496. This stands for ‘4′ stroke and ‘96′ decibels.
On the 250, it makes the bike sound really cool, but still passes the DSE noise testing machine every time. It’s louder than stock, but not offensively loud.
As an aside, when I bolt the 496 onto the CRF250X, I cut the top out of the airbox (without even removing the airbox !!!) then go to about a 160 or 165 main jet, one larger on the pilot jet and the pilot screw turned out to around 1.5 from full in.
I’ve tried other needles and clip positions but they don’t seem to improve it.
The thing then rocks, with bulk more torque down low and in the mid. I raise the gearing from 14/53 to 14/50 and it’s a whole new bike. An added bonus is a weight saving of 1.5 kgs and a much better bling appeal.
Enough ranting about the 250 pipe, this is supposed to be about the 450X pipe.
The 496 also transforms the 450 in a similar manner performance wise, but is unfortunately louder. This is simply because it’s the same pipe essentially, but the 450 puts out more bang and just plain makes more exhaust noise.
It really is quite loud and even from new, with the quietest end cap available, they can fail the DSE noise test. I recently had a freshly re - packed 496, with a new quiet end cap test at 97.5 db.
Here is the quietest end cap they make.
They also normally have a spark arrestor attached, which is just a fine wire mesh. This is an old cap and the mesh has vanished. They rust, fatigue and get blown out the back eventually. You can still see traces of the mesh on the left.
You can hear the difference compared to the 250 and personally, I think it’s too loud. I’m lucky in that nearly all of my riding is far away from other people so there are few to annoy with the noise, but some of you riding closer to Melbourne may be giving people the shits with that much noise.
So I convinced my mate Rob to mig a little extended pipe onto an old end cap I had laying about the shed. I used a standard motocross type end cap that is normally very loud.
Compare this one to the first one and you can see it’s shorter with a bigger diameter pipe. So I’ve actually started off with a louder unit that what I was already using.
I got the pipe out a scrap metal skip out the back of a mechanic’s (with permission - scrap is worth money these days).
The mod has reduced the noise to roughly equivalent to the 250’s, which is sweet. Even better, I am unable to tell the difference in performance. No shit, can’t tell - still goes ace.
Cost? One washer, a few zots with the mig, four stubbies of VB mid strength.
Pro Circuit Australia asked me to send in some pictures of my ’secret’ mod, to show the Yanks! I would have thought that noise was at least as big an issue in America as it is here, but apparently not, if their ‘quiet’ pipe is too loud.
Quieter is the way of the future. I know we all want bulk grunt and that means generally a little more noise than stock, but bulk grunt is not much good to you if the noise police won’t let you ride the bike at an event like the Yackandandah Charity Bash.
If you run an ultra loud pipe, consider a similar mod to mine and we will all win in the long run.