I have been running the old style Doppler exhaust since 2008 and loved it, but this new pipe from Doppler is ridiculous. It's quieter, crisper and added almost 5 mph to my top end, with no change in variator or carb tuning. It's also a little smaller so I have better ground clearance. Great pipe! There is a hidden restriction in the silencer if that's something you are interested in.
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1 taco eaters like this review
high quality exhaust, Made by Yasuni
August 28, 2020
taco eater :
Marcus Pimentel from Smiths, Bermuda Bermuda
amazing exhaust, but restrictors must be removed. one in header, and one in the silencer. once you do this then you will find that lost power
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1 taco eaters like this review
gained top end but lost meh bottom
July 30, 2020
taco eater :
noodles from dorchester, MA United States
the quality on this pipe is fn legit. My setup is an av7, 47mm airsal, 16mm sha. I gained another 5mph over the turbo kit MBK performance pipe with SIDE BLEED I had on before but lost that sweet sweet take off. Going to swap out the sha for a mikuni vm 18 to see if having that 3rd circuit will help adjust the take off. This pipe beats out the turbo kit MBK performance pipe with SIDE BLEED because you dont have to go hacking off your kickstand
gained 5 mph over old style Doppler pipe 
gained top end but lost meh bottom