taco eater :
Matthew Mulligan from terryville, CT United States
The biturdo had done me just fine for the past 2 years but it was long overdue for an upgrade. Grabbed this pipe, the 17.5mm phva and the micro 90 intake. MAJOR difference in acceleration and power delivery. Went from 40 max with a 30-35mph cruising speed to 45 and 35-40 with no other changes except port matching. This is with me at 200lbs, a full trunk and 4 layers of clothing on. The pipe comes on way harder and actually pulls like a kitted bike now.
Running a ported stock cylinder, the cheap "a55" replacement piston (really a puch piston, the crown sits 1mm higher from wrist pin center), stock airbox, 26/24 gearing and a 3" knobby in the back.
Edit: I forgot to mention that it did NOT fit the bike. I had to bend the header and re drill the mount holes. I did buy it with that in mind, but I suspect it may have had fitment issues on a sprint as well. All in all, not the worst thing. The angle wasn't far off and I could care less what the mount looks like with extra holes.
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Great A55 pipe. Used on Sprint.
August 15, 2022
taco eater :
Dave Thacker from Tipp City, OH United States
This review is for the A55 version of the Estoril Side bleed Pipe. I have one of these on an A35 and like it just as much on one of my A55 Sprint. The overly loud Bi-Turbo had lost all it's packing, and the stinger weld had given up in the muffler section. I left the two gaskets on, bolted this pipe on. Went from #60 jet in stock carb to #66. (Stock carb, don't remember the idle jet used) Runs 42 to 43, 45 in a tuck (265lb rider). Stock cly and head. Note, the last bend in the header before the first cone is curved a bit too much. I bolted it to the header and heated the inside of this bend as much as I could for about 15 minutes with a propane torch. Flexing it down to line up the two flange bolts got easier. This opened the bend up enough with minimal stress on the cylinder studs. This unit is way quieter and worth the money over the Bi-Turbo although it probably is the same speed. Lots more class, less fall apart hassle.
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Works great until the muffler falls off.
August 10, 2022
taco eater :
Anonymous Person
This exhaust was on my bike when I bought it used. Performance was good, my bike boogied with this exhaust on it. One day I heard a loud bang, looked down and noticed I no longer had a muffler. The welds broke completely and I now had a gaping hole in the pipe where there was once a muffler, which was screaming at me the whole way home. I ordered an MLM exhaust to replace it, that said I wouldn't rock this exhaust again given the experience I had, but I will give it the benefit of the doubt being it was used and I don't know how bad it was beat on before and experiences can vary so someone else may have a better luck than I did.
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works well, but does not fit
November 15, 2018
taco eater :
Eric Sabatino from Portland, OR United States
We run a Tomos dealer in Portland. On a new Tomos Sprint, it requires quite a bit of modification to fit. We had to bend the header pipe and grind out the holes on the mounting bracket. About 2 hours of work to put it on. Once installed, the bike ran great. This pipe gives great performance gains.
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Heckin' good, high rpm ripper.
September 6, 2018
taco eater :
Anonymous Person from brooklyn, NY United States
I do 52mph with this pipe, a55 airsal matched to cases, 17.5 phva with an 18mm intake. 26x22 gearing. About 10,000 rpm. Stock tomos ignition. yeah.
The reason it doesnt get 5 stars is that the flange did not mate flat with the cylinder, had to whip out the belt sander and slot the rear holes and use a crush gasket. No pedal clearance issues.
Worlds better than the biturdo. 
Works great until the muffler falls off. 
works well, but does not fit 
Heckin' good, high rpm ripper.