hi guys , i own a 85 260 transit and would like to know if it is possible to hike up the power to the same as the 100 bhp

i have seen tuning boxes on the net but unsure if there suitable for my model , is the 100bhp the same engine

and any parts a straight bolt on to help achieve this , i know mine has no intercooler if this helps , i dont want to sell my wee workhorse as it stands me well and want to get another 2 years out of it , but if anyone has any advice from simalar experiance would be great many thanks