another boring post on exhaust choice...

Hi Scooter Shack community !

I'm from Normandy, a raining country as you probably know
I also love my Runner 180, used daily to go working. damned, this is a really good scooter !

Here is my motor setup:
- Malossi 172 with homemade cylinder head (centered spark), 1mm squish, 13.5:1
- stock exhaust (not catalysed)
- BGM crankshaft full circle 52mm
- VL16 + VHST 28 + Honda SH125 modified airbox
- Multivar Malossi with 15.5gr, Piaggio 180 belt
- Delta Clutch (yellow springs)
- Original torque driver with Malossi Red spring, Original 180 transmission
- Leonelli ignition

As all 2 strokes passionated, i always need more so i'm thinking about exhaust.
I have 3 criticals wishes:
- not rpm hungry exhaust because cylinder's diagrams are stock
- quiet exhaust because i'm driving exclusively in city
- focus is on acceleration not on speed

I made many search on internet and here is my conclusion:
- PM59: best performance but is loud, breakable and quickly rust
- Malossi: rpm hungry, loud...
- Jolly: not rpm hungry, rpm power band is in a stretch area, quiet, focus on acceleration, rust
- tecnigas, kundo etc -> shit

One exhaust is a mystery: SIP performance This is an unrestricted Scorpion exhaust (no restrictor pipe inside cone) with a longer muffler.
It seems to have the following properties:
Pros:
- no rust because stainless steel
- quiet (because longer muffler than scorpion)
- really not rpm hungry (need +0.5 / +1gr than original rollers...)
Cons:
- heavy
- expensive
- no top speed improvment

Here is an old dyno test:















What do you thinck about sip performance exhaust for my setup ?
Is PM59 really loud ? can we make it quieter ?
Perhaps my 3 criticals whishes are not feasible and it's preferable to keep my original exhaust ?

Many thanks for your help

 

Here is some head's pics.
Spark is centered and this head is compatible with original cover.
It looks like Kubler's head but KB is using a special spark







Thanks Minor for your advices. Jolly Moto exhausts was my first choice but I was intrigued about SIP exhaust.

Since 1 month, I tried to contact Shiny Red Tuning by email because i would like to have my flywheel lightened but he never respond to my emails
In the meantime, my stator dead so I purchase a complete leonelli ignition (stator, rotor and cdi)
Here is some weight pics ;-)

 

I have seen your old post about lightened flywheel and Shiny Dyno test. Seems to be a great improvement for cheap (if you find a lathe as you say)
PM59 seams to be really loud... a shame for an expensive exhaust. I think PM Tuning could have a longer muffler....
Thanks for my head but it's not my work, i bought from an italian little productor who is also member of italian runner's forum: http://gilera.forumfree.it/.

Open filter is not safe for my daily use (remember my country is really raining ;-) )
Here is my modified Honda SH125 airbox:

As quiet as original but a real gain at full throttle (need main jet ajustment of course)

When I was running PHBL 25, my settings was:
- min jet: 45
- max jet: 88 (original airbox)
- AQ264 emulsor
- D24 needle
- 40 cut valve

Instead of paid for dyno every changed I made, i bought a Koso Power Test. A really great tool
Tomorrow i will install Leonelli ignition on my runner
Have a good night !