L31MaxExpress
I'm Awesome
Well I can say without 100% a doubt the Spectre 4" MAF housing is garbage. The metal tube is not a problem, the cheesy thin plastic adapter warps, the metal screw inserts that hold the MAF fail and the setup becomes an unfiltered, metered air leak. I started noticing my fuel trims spiking up and found the MAF barely hanging in place. I will try to remember to get a picture of how it failed, but just a warning to guys considering using it in their builds.
I was going to order an inexpensive universal aluminum 4" LS cartridge MAF housing (I saw numerous examples under $50 just a couple of months ago) but they seemed to have dried up availability wise, perhaps due to the EPA. I refuse to pay $300 for something like the Lingenfelter or Haltech MAF setups merely because those companies want to gouge Corvette owners. I did some digging around and GM offers the newer Express 6.6L L8T air box for the newer vans brand new with a new filter included for $83. Luckily it comes with the mounting provision for a cartridge style MAF sensor. Pretty nice looking factory air box compared to what GM put on the older vans and for good reason, the L8T is a 401 net hp engine even in the vans. GM did a better job on the L8T vans to ensure the full power of the engine was not reduced unlike the 5.7L and 6.0L vans that were choked by the factory air inlet and MAF. I snagged a couple of pictures of a used but identical airbox being offered on Ebay for more than 2x the money of the new GM part. The pricing for the GM airbox honestly surprises me but I am not complaining at all. It will be here in a few days, I will figure out the mounting(looks like GM kept the same mounting points as any 01+ van), then get the ducting squared away and likely have to work on the MAF table a bit. I do like that it will keep somewhat of a factory appearence underhood.
I was going to order an inexpensive universal aluminum 4" LS cartridge MAF housing (I saw numerous examples under $50 just a couple of months ago) but they seemed to have dried up availability wise, perhaps due to the EPA. I refuse to pay $300 for something like the Lingenfelter or Haltech MAF setups merely because those companies want to gouge Corvette owners. I did some digging around and GM offers the newer Express 6.6L L8T air box for the newer vans brand new with a new filter included for $83. Luckily it comes with the mounting provision for a cartridge style MAF sensor. Pretty nice looking factory air box compared to what GM put on the older vans and for good reason, the L8T is a 401 net hp engine even in the vans. GM did a better job on the L8T vans to ensure the full power of the engine was not reduced unlike the 5.7L and 6.0L vans that were choked by the factory air inlet and MAF. I snagged a couple of pictures of a used but identical airbox being offered on Ebay for more than 2x the money of the new GM part. The pricing for the GM airbox honestly surprises me but I am not complaining at all. It will be here in a few days, I will figure out the mounting(looks like GM kept the same mounting points as any 01+ van), then get the ducting squared away and likely have to work on the MAF table a bit. I do like that it will keep somewhat of a factory appearence underhood.
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