stevenchkim
Go Kart Champion
I would've said Advansuper but he's been banned, or even Diego, but he has a new username and isn't on here much anymore. FocalPoint needs to get banned at least once and come back with a new username to be undisputed troll-king of MK6
Seriously, tho, +1 on Simmsled & Whitejames for suspension. Reading their contributions here, on the 'tex and in MK5 helped me a lot when making my suspension decision.
+1 also for Plac on downpipes and intakes, but don't forget his DIY on the S3 intercooler. That thing is tremendously helpful for taking down the bumper and support.