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I agree with you owen... I hope mine intake pipe is not too big also...

Mine is 55m. I am happy with it. The 75mm i had before was worse imo.

55 is the same as the TB no??? its probably best to keep it all about the same diameter really. maybe starting bigger and gradually reducing to the same as the TB...

mynameisowen wrote:55 is the same as the TB no??? its probably best to keep it all about the same diameter really. maybe starting bigger and gradually reducing to the same as the TB...

actually i thought it is better to have the intake pipe little bit bigger than TB, so the air gains velocity in the passage. cheers

yes thats a good theory, but not lots bigger i think otherwise you will have a big depression after the TB.

Today i moved to a 75mm intake tube placed on the apexi filter in contrast to the 55mm simota filter and tube i previously had. I must say that i noticed a decrease in power from 1500 to 3000rpms. From there on, it's way too better. It becomes better and better as the revs get higher. I am a bit disappointed about that though. I may make another 55m intake tube to fit to my apexi filter.
What sizes do you use?

well maybe make something in between

I think you loose to much velocity in the 75mm pipe at low revs, probably not worth it.

i've noticed that at low revs (1500-3000). I'll make another tube like my old one. But no more experiments as they cost So 55mm it is.

Got this one now, will measure it tomorrow and compare it with the carbon whale penis intake.

nice one looking forward to your feedback