If you want your truck to lean out and knock and ping then get a Granatelli cuz thats all they are good 4. I had one on my truck when I first got into trucks and thought that any bolt-on is good. NOT TRUE I learned quickly about the LS1's and a MAF doesn't do crap just a waste of money . Get a cam,headers,somthin' else that makes power oh by the way if you read that article about the 55 hp Granatelli crap in the truck magazine about 2 months ago that is BS and everyone thought so too. Do your research before you buy and don't always go buy something a magazine says it is good. Research ask questions about anything that's what this web site is about.

 

I meant aftermarket or modified MAF. Everything I've heard sounds like what 01wtahoe said, leans out and doesn't really help.