umm... I use Upsolute and I love it. No CELs, not much surging, huge power gain ... all around goodness. I think the guy's name that did my GTI was Randy Hall. They come to your house and do it (or you go to their garage) ... it doesn't take long. I would suggest getting an aftermarket DV and maybe an N75j valve after chipping also .... but you probably already know this. Good Luck.