As of now ive got a stock 2000 z28 that I purchased about a month ago. I upgraded from a 1995 z28 with a few g's of work. As of today I sent out a check for my GMMG cat-back and plan on ordering the basics tomorrow. However i found TSP a few weeks ago and saw their 85 mm lid and the 85 mm MAF package. Is this really worth the total 350.00 for the extra 10 mm over the stock 75 mm lid and MAF. I'm buying a lid, maf, KN, and 80 mm BBK TB no matter what, i'm just trying to decide if the few extra clams is worth it for the 85 mm lid and maf.