[KRAM36]

Originally Posted by Lapister

Kram, Need another clarification, on the Honeycomb 75mm for Maf they come in different ratios for cells. Remember which one? Seems default on website is 4:1 ratio. Gathered most parts and getting jazzed!

Yes 4:1

Originally Posted by Reebuck1

KRAM36 where did you order the larger pipe from and what size was it?
I to am wondering if the larger diameter exhaust pipe will give me a pick up in HP
and still provide enough back pressure. My CAT by pass is 40mm.

80mm 3 1 8" inch Aluminum Turbo Intercooler Pipe Piping Tube Tubing Straight | eBay

Originally Posted by jsceash

The real problem isn't the 987 MAF or the 996, 76mm throttle body. It the stock 996 Plenum. There is a lot of engineering data some in this post.
http://986forum.com/forums/general-discussions/31693-maf-throttle-body-diameter-10.html
That discuss the problem, which is the Plenum design that create a massive turbulent blockage.
Then a spin off where a members was designing a retro plenum, very similar to IPD's design. I don't know where this led after the thread died.
Intake plenum and 911 throttle body

The IPD does make this transition but the price is somewhat objectionable to some members.

The 987 MAF housing is an issue. The ECU can not read the air volume properly with the 987 MAF housing. You will get a CEL and run the car lean using it without a tune.

The 997 Distribution T has just about zero turbulence because of the generous radius it has coming off the TB tube, allowing the air to flow smoothly into the plenum.

IDP plenums are a waste of money. I had a long discussion with the guy that does the tuning at Softronic and he said never to use one. He also said not to use the 987 MAF housing as it will hinder low end performance, unless your foot is to the floor 90%, using the 987 MAF housing is a bad idea for a street car.