Howdy Everyone.

I was wondering if anybody had any insight on Malossi exhausts for the 2015 primavera/sprint.
There are two Malossi exhausts I'm looking at:

Malossi Racing Exhaust For Vespa Primavera and Sprint 150:

https://scooterpartsco.com/vespa/sprint-150/sprint-150-exhaust/malossi-racing-exhaust-for-vespa-primavera-and-sprint-150?zenid=e09a097c253b6be794963a9b4145c2d9

Malossi MHR Racing Exhaust for Vespa Primavera, Sprint 150

https://scooterpartsco.com/vespa/sprint-150/sprint-150-exhaust/malossi-racing-exhaust-for-vespa-primavera-and-sprint-150?zenid=e09a097c253b6be794963a9b4145c2d9

Does anyone know what the difference is with these? Should I get the Malossi Lambda emulator? Does anyone have one that can vouch for it?

My current set up is the stock engine, SIP cluster, Malossi Variator 13.5 gr rollers, Malossi clutch. I'll be adding the Malossi X-belt, new rollers, new Malossi variator fan (just came out) and Malossi airfilter next week.
I appreciate any recommendations or suggestions!

Thanks!