im not sure who posted the info in your blue colored text. i have to wholeheartedly disagree with his opinion on the tunes. run a 181 or 185 pulley with intakes and no tune and you might want to have a spare engine on hand cause it wont be long before you grenade yours.
when modifying these ecu controlled cars the tune is most likely THE MOST CRITICAL PART of the modding process.
if anyone doubts it cruise the e55,c32 forums and see what happened to those that modded and didnt tune. as for getting the cheapest tune it is better than none but now real time driving tunes and dynos are the best way to most out of your mods and engine.