Silverpilen's Voice / Husqvarna 401 + AR GP1 copy + Midlink Pipe + Partial Cat Delete + DB killers

Описание: I was quite happy with the stock exhaust with the silencer removed and just replaced with a stubby "silencer" but since I increased the intake airflow with a high flow air filter and DNA Stage 2 airbox lid, the bike's top end was choking as the exhaust gasses couldn't get out fast enough. So I removed the 2nd catalytic converter, removed the resonator (it heats up so much without the cat), and replaced it with a midlink pipe and an Austin Racing GP1 copy. It was too loud though with idle averaging 97-99dB and running at 130+dB. Low end torque suffered too as the exhaust route was a bit shorter while top end was running lean as exhaust scavenging was too much with fuel-rich air just getting sucked out into the exhaust (cool after-fires though).

So the next challenge was to install a dB killer which ended up to 3 dB killers. 2 perforated-type dB killers were installed in the end can itself and the pipe between that and the midlink pipe. The sound was reduced (90-95dB idle, 120+dB running) but still too loud for me. Also, low end torque was still a little sluggish but top end improved. I found the the most sound while running was actually at the midlink pipe which kinda makes sense. The stock resonator removed much exhaust sound. So I made a custom dB killer that can regulate the airflow passively and installed it between the end of the header pipe and the midlink pipe. It had a funnel-like shape with a catalytic-style honeycomb at the center and perpendicular slits around it on the funnel wall. At lower to mid revs, most of the exhaust goes through the middle creating a little more backpressure that brought back the torque at low-mid revs. At higher revs, more exhaust gases can push through at the slits effectively evacuating more exhaust gases to not choke the top end.

Honestly, it was a lot of trial and error, sweat, burns, and I actually had to learn how to weld and grind metal myself! But I'm so happy in the end. The engine seems to be very happy. Loudness is at 86-90dB idle and around 115dB while running. No overheating, no heat soak on the monoshock, great torque at low-mid revs and no power loss at top revs. Right now, I am reaching 92kph at 2nd gear and around 118kph at 3rd which is just my cruising speed. Also, no stalling at all. Mileage is around 23-25kpl so a little bit lower than before which was 27-29kpl but not bad. Also, I would still get the ECU flashed eventually as there is some little throttle hesitation when upshifting at top revs which FuelX just can't help with. But for now, I am very happy with everything.

If you were just using the stock paper air filter with the DNA Stage 2 or stock lid with a K&F filter, keeping the resonator and just removing the silencer and the 2nd catalytic converter would be enough. With FuelX Pro+, you could fine tune the AFR also up to mid rev without the top end suffering too.

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COFFEE GEAR
Breville Dual Boiler (BES920XL)
ZF64W Grinder

MOTO GEAR
Husqvarna Vitpilen 401 (2022)
LS2 Rapid 2
Ryo RF-6V
Skyvent Q4 Intercom

CAMERA GEAR
Nikon Zf
Fujifilm GFX 50R
Nikkor Z 40mm f/2 SE
Viltrox 85mm f/1.8 Z
Minolta MC Rokkor-PF 58mm f/1.4
Carl Zeiss Planar 100mm f/2
Takstar SGC-600
Zoom F2
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