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I made a IPD like diffuser in the air intake on my (previous) 993. Instead of the T-shaped plenum just below the throttle body, it was Y-shaped, dividing the flow to each side more efficiently. I used an aluminum sheet, and formed it to fit inside. Look at the shape of a typical IPD plenum, and you will see the difference. A bigger throttle body would be good too. You can bore out your existing one.
I also flipped the whole intake 180 degrees, so the TB and MAF sensor was pointing rearward, and cut the plastic between the TB plenum ad the resonance plenum, so I could rotate the TB plenum. In this way I could fit a cone filter and velocity stack to the MAF sensor body, and tuck everything under the RS spoiler that I had on my 993. I also made a box around the cone filter, to scoop cold air directly from the spoler.
I never dynoed the engine, but there must have been some gains, even if the internals were stock 3.6L. And it sounded awesome!
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1985 928 S3, 5-speed
1987 Carrera, current project
2012 Jaguar XF 5.0, Wife's d.d.
2009 Boxster,sold, 2000 Boxster, sold, 1995 993, sold, 2004 Maserati, sold, 2000 996, sold, 1971 914, my college car, 1966 911, sold way too cheep, Lots of VW's...
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