DUE to extreme popularity Cooly Rocks On is already planning to invade the streets of Tweed for next year's festival.

The nostalgia festival's CEO Bob Newman said Jack Evans Boat Harbour went from housing 80 classic cars to 250 in 12 months, but there was room for many more.

"After we mapped it out we think next year we can fit about 350 more cars in there," he said.

"This year we've had to knock back so many cars.

"So many people just want to be part of this festival."

Mr Newman said he planned to take over parts of Bay St, out the front of Centro Tweed Shopping Centre, to house more classic cars.

"I want to keep in walking distance," he said.

"Tweed Shire Council and the Gold Coast City Council all contribute to the festival so it's only fair."

It's easy to see why the festival needs to expand, last year Queensland Police estimated a total of 78,000 national and international visitors to the festival.

A report by Destination Research and Development said an approximate economic impact to the region came in at almost $30million.

Mr Newman said it was likely to be much higher if the weather played nice.

"If the gods are kind to us I might hide in my office because it will be so busy you won't be able to move," he said.

"It is already a great festival but perfect weather will make it magical."