Well I'm sure others have had this problem. I'm running a build B20VTEC in my CRX EE8. I currently have a 2,5" Injen CAI for the SI but it's no where big enough.
Should I run with a 4" or would 3" be good?
Does anyone make a 3" or 4" CAI for the CRX?
The engine will be pushing around 230 whp.

Here a pic of my engine bay:

 

What TB ya got on there? Not much point in going huge on the intake and leaving a much smaller TB on there. 2.5" = 63.5mm. Probably a 2.5 or 3" intake would be fine.

 

This are the current specs on the engine:

B20B3 block bored/honed to 85 mm.
Import Builders Spec. Wiseco 12.0:1 pistons
Probe Industries Ultra Light rods
Hondata B16A Heatshield
ARP head studs
Stock B16A1 head, intake manifold and tb.
Injen CAI for Si
JG Edelbrock header with IB 2.5" collector
3" Thermal cat-back system
2.5" Carsound cat.
7 lbs Clutch Masters flywheel
ACT 6 puck clutch with Extreme pressure plate
B&M fpr.
Hondata S200 with P28 ECU

The next mods to the engine will be:

Skunk2 stage2 cams
STR cam gears
IB Spec Valvetrain
Skunk2 intake manifold
STR TB 70 MM
Port and polished head
Portmatched intake manifold, TB and head

So I will need a bigger intake when the new parts get installed.

I know you can use a Civic Si '99 B16A DOHC intake in 2,75" but I really don't want to move the battery.

Which intake does people use in there Civic/CRX with the CRVTEC,LSVTEC or B18C swap?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRXEE8 &raquo;</TD></TR><TR><TD CLASS="quote">I know you can use a Civic Si '99 B16A DOHC intake in 2,75" but I really don't want to move the battery.</TD></TR></TABLE>

remove the battery, this will solve your problem and also transfer weight to the back....

 

why not just build your own CAI and call it a day? These aftermarket companies are just taking your money, any muffler shop can bend pipe in whatever diameter you want- I woldn't go larger than 3" though..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JCushing &raquo;</TD></TR><TR><TD CLASS="quote">
remove the battery, this will solve your problem and also transfer weight to the back....</TD></TR></TABLE>
which is bad for drag racing...
you want as much weight at the front as possible, if he's got a b20 I can only assume he's draggin it up.

 

its cheaper to buy an intake on ebay than it is to make your own 3"

 

Ok... thanks for the advises.
Yes I will be dragging but only once in a while. It's daily driven and not a track car.
So you guys are saying I should buy a 3" instead? Will the 2,5" be limiting the performance at high revs?

 

basically, you will want to match your largest part of the TB, this is assuming that the TB is tapered. I would go 3' which would be about a straight shot to a 70mm TB that should taper to 68 which would increase velocity.