Vespa exhaust bgm PRO BigBox SPORT

bgm PRO Bigbox, the legendary Exhaust for Vespa Classic, is now available as a sport version.

The bgm BigBox Sport - the wolf in sheep's clothing

Exhaust -BGM PRO BigBox SPORT- Vespa PX80, PX125, PX150, Sprint, GT, GTR

You can find the version for 200 engines here: Vespa exhaust bgm PRO BigBox SPORT PX200

Performance like a Vespa racing exhaust - optics & acoustics like a standard exhaust, Handmade in SPAIN!

The Vespa racing exhaust

The bgm BigBox Sport is a thoroughbred racing exhaust, in the unsuspicious design of an original exhaust. She positions herself as better alternative to conspicuous and mostly loud and large resonance exhaust systems. The high level of motivation clearly sets it apart from other boxing systems. Designed for performance-oriented drivers who appreciate the benefits of an inconspicuous vehicle.

Like any good racing exhaust, the Sport Box requires a powerful engine concept in order to be able to develop its full performance. Around cylinders like that Quattrini M1X and Co. it offers impressive results. It also supports engine outputs above 25PS without any problems and pushes ahead with full torque. Despite its high peak performance, the Sport Box gets in early and also enables comfortable driving.

Not for series or touring engines

Due to its consistent design for a high gas throughput, the BigBox Sport is not intended for use with near-series engines or tame tuning cylinders. It needs a clear and powerful outlet impulse to fill the large volume and the thick elbow of the Sport Box with life.

Due to the significantly increased volume and a new manifold, the BigBox Sport is a powerful companion for engines with sporty characteristics.

That is new

Compared to the BigBox you have known so far, we now have the BigBox Sport for the small motors of the Vespa Largeframe Models, in addition to the new manifold, also incorporate other changes.

• elbow
• Penholder
• Clamping on the cylinder flange
• Bracket on the motor traverse

Development and test runs

Among other things, an engine with an LML membrane, a 24 SI carburetor and a 60 bgm crankshaft served as a test victim.

In addition to one Polini 177 we also have an unedited one here Quattrini M1x plugged onto this engine.

Despite the small LML membrane with the thick steel plates, the Polini 177, which is known to be rather tame, develops a remarkable curve.

To something more overflow duct and outlet area, the BigBox Sport reacts as expected - here in direct comparison with a Quattrini M1X on the same engine.

When relocating the new large manifold, we looked for the best possible way so that there was enough space for the roadway, frame and main stand, which was not so easy with the dimensions of the new Vespa racing exhaust. We needed some stencils, samples and test systems so that the process now applies to almost all of them Largeframes fits.

The development of the new Vespa exhaust

From the first prototype (left) to the finished, tested and approved exhaust,

it was a little further way ...

However, we also made sure that the bgm PRO BigBox Sport, sits correctly despite its dimensions. Especially with the Vespa Rally and Vespa Sprint models
it is quite difficult, due to the chassis geometry, the position and the distance of the main stand to the engine, one good course a DAK Bungalow.

However, we definitely recommend for Vespa Rally / Vespa Sprint and similar models to check the distance to the road and maybe a little longer distance piecek to be used for the rear shock absorber.

We have to exclude the use on the Vespa models with 8 ″ tires on our part.

Vespa bgm PRO BigBox Touring

Of course we also looked in another direction:

So that you can use an original cylinder from Pinasco, DR or a PX150 can also take a BigBox for a walk, we are currently doing one Touring variant of the BigBox to develop. We have focused on an even earlier performance and torque entry. The BigBox Touring is also available on the Vespa Largeframe Models with 8 ″ tires can be used.

The Vespa BigBox Sport takes care of: