Contour Enthusiasts Group Archives Forums Modifications Zetec Performance SleeperZ intake installed

Hey Sleeper,
I have a question I have been doing alot of research on your intake system. I know you said use 2.75 couplers for the system but I notice on the CTA intake their using 3 inch couples.Will the 3 inch coupler take away from the performance? The price of three inch couplers at CTA are over half the price of 2.75 couplers at AJ-USA. If it is possible to run 3 inch I can run down to my local home depo and buy a coupler for like 4 bucks. I would also like to know if anyone is running 3 inch couplers and pipe if so how is the system doing.

I don't see any problem in using 3" couplers if you have 3" piping. There would be no point in using 3" couplers on smaller piping because it wouldn't fit.

My setup is 3" and there was no problems with it.

2.75" piping is the optimal size diameter pipe.
Going to 3" won't really hurt.
The point of the 2.75" pipe is that the TB is the same size so the airflow doesn't have to change pressure.
I would try to find a 2.75" to 3" 90 degree coupler to connect the TB to your piping.
Using a 3" coupler will cause turbulence at the TB.