The group, led by Shahabuddin Ahmad - a representative of Pertubuhan Islam Gabungan Amal - lined the area with their motorcycles about 1pm and honked noisily for about 15 minutes before the police dispersed them.
Their mission appeared political as most of the bikers were wearing yellow T-shirts with the words ‘LGE racist’ - a reference to Chief Minister Lim Guan Eng - and ‘Save Penang’.
They also unfurled banners reading Mahu litar lumba (We want a racing track).
Five protestors, including Shahabuddin, were detained by the police who had been trailing some members of the group from Komtar, the state's administrative building.
It is learnt that the mat rempit had proceeded from Penang Road to the state legislative assembly building along Light Street.
During the arrests, a minor scuffle broke out between the police and several protestors who were shouting. One threw his helmet on the ground.
Parts of the Komtar building had earlier been defaced with graffiti reading Guan Eng tipu Melayu (Guan Eng has lied to the Malays), but it is not known if the group was behind this.
Georgetown OCPD Gan Kon Meng said the group had planned to hand a memorandum to Lim over several issues affecting them.
"We allowed them to submit the memorandum because we are a democracy. But if (any gathering) is not peaceful, it can create chaos and cause lost of property," Gan said.
Those held will be investigated for illegal assembly under Section 27(5) of the Police Act.
Told of complaints of police violence during the arrest, he said it was probably because the protestors had resisted enforcement action.
However, Komtar assemblyperson and Lim's political secretary Ng Wei Aik (right) was upset with Gan for not doing his work professionally.
Ng said Gan should explain why he allowed the 'illegal' protest when this was clearly "a politically-oriented rally".
"Asking for a racing track was merely an excuse. I do not think it is related. All demonstrations (here) are easily linked to Umno," he alleged.
"Someone sold Umno's agenda to them. If it is not political, why do they say ‘LGE racist,’ when mat rempit are only mostly interested in racing?"
Seals: This is a Joke of the year... a dying party using Mat Rempit ? Every other state has a racing track for Mat Rempits? LOL! LOL! LOL! And LGE did not allow in Penang? Anyone with brains can smell the agenda.
Why OCPD allowed it? When it other state you will see a water gun in the other state?