My cheap tuning box / glorified Every Mod type costs $35 on eBay , I put a link but noticed the prices are higher now.
http://www.ebay.com/itm/Tuning-Chip-...f116b7&vxp=mtr
Tuning Chip Box Volkswagen Golf IV 1 9 TDI 90 110 PS More Power Powerbox Diesel | eBay
If I turn the set screw clockwise 2.5 revolutions from its stock position the car is peppy / fast throttle response. but if I turn the set screw 1/4 more of a turn the exhausts starts smoking soot. So I keep it turned down to +2.5 turns from stock.
This little cheap tuning box works !