I live in a hilly hilly hilly campus and want to ride my grande doubles with my girl - so I thought I'd go with a circuit pipe. I'd like something that'll work with a stock cylinder and have room to grow into a 13mm carb, high flow filter and an olympia kit. I've already drilled the intake out to 13mm and removed the brass vario limiter.
nearly every entry in the performance spreadsheet is with a different exhaust and I've read a lot of the reviews on treats - SO, since people love talking about their setups - sell me on the pipe you love.
Here's what I've gathered so far.
vespa piaggio tecno circuit performance pipe - nice and torqy but has mounting issues with grande. seems people are using them on kits and stock cyls
vespa piaggio simonini circuit performance pipe - not gonna do jack shit on a stock cylinder - is this true??
vespa piaggio moped PROMA circuit performance pipe - good on kits, good stock, great all around performance at a good price.
vespa piaggio simonini circuit performance pipe black black - no reviews on treats, only kitted motors in the performance spreadsheet with seemingly lack luster performance
leo vince vespa performance pipe - seemingly for stockish stuff??? kinda pricy. Looking to spend no more than $120 unless it's just THE SHIT 4real
The polini pipes just seem expensive and comparable to tecno pipes. I'm leaning toward the proma currently... GO!