Moped Army

Okay I was looking around www.50cc.nl for an affordable exhaust and I found many models. Which exhaust is going to give me more bang for my Buck?(I have a puch maxi)

jamarcol cross cr. $23
bullet $27
biturbo $28
proma grand prix black $27
techno racing $30
techno hunter $40

You hear a lot about the biturbo and proma circuit but what about the other exhausts?

The Biturbo,the bullet and the proma grand prix black look the same. Which one is better?

Does the techno hunter compare to the proma circuit?

There are two biturbos listed and the only difference seems to be the price and the colors. Whats up with that? Are they the same?

Will these exhuasts fit on a puch magnum too?