PVC is no good in the engine bay, it melts easily and lets off toxic fumes.

We dyno tested my intake pipe on 3 cars with different lavels of modifications.

Firstly was my Fairlane Concorde with no engine modifications, 2.5" exhaust and SS CAI, i gained 1rwkw.

Second was data_mine's falcon, he has a stage 2 ALTED cam, 2.5" exhaust. he gained 2rwkw.

Last was fordfreak_ef's falcon, he has more extensive engine mod's but i'm not sure what exactly, he gained 2rwkw over his current 3" mandrel bend intake. My intake pipe is alot shorter and more dirent than his current system.

these runs were straight swap over with no time given for the computer to adapt and learn. after 500km or so the figures should improve.

the A/F ratio was also improved in data_mine's car that does not have a chip installed or been tuned.

Hope this helps and gives you an idea over the different types of pipes being made. i will post pictures of my intake this afternoon hopefully.

pic and results:
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(pipe on concordes fairlane).

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(my car with stock intake - for those of you who don't know?)

My dyno chart, not just peak 2RWKW, but 2RWKW everywhere. Again this is with no time for the ECU to adjust.
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Really? What's your name, if ya don't mind me asking?

I work for OneSteel in Somerset, TAS, you blokes do the Elphinstone bends for us...