I have the Greddy SMIC and there is 2-3 more inches of space that just feels wasted.

 

No, none that are any bigger. Any of the SMICs that fit with the stock intake are designed to work with the stock battery too.

What's wrong with your Greddy?

 

Sell it and get something else

 

I think the Pettic cool charge II might be what your looking for
My car but with the 51R smaller battery

Toms car with the original battery

I can't say for sure the stock air box will fit .....

 

Nothing is wrong with it. Just interested in trying out something different that might increase the cooling capacity if I can just use that "wasted" space between the smic and the 51R

 

how is the greddy smic though?
i just got one and havent installed it yet
i know its going to look better but im in it for the performance..many people say its only a bit bigger than the stock IC and it doesnt even do a difference...
but im thinking....then why the hell would greddy make a product that doesnt add any performance

 

Greddy SMIC fits great.

and is CARB approved, so the smog ***** can't give u grief.

 

The greddy is more than twice as big as stock. It will help a lot.

 

just looking at it, it seems almost twice are thick as the stock ic
i dont know how people say its a LITTLE bit bigger

 

There are a thousand threads on this but as to size:

Stock cooling area 52 in sq, charge flow 29 in sq, volume 129 cu in

Greddy: 93 in sq, 50 in sq, 371 cu in thus twice cooling area, twice charge flow , 3 times volume

Pettit CC2 (old) 105 in sq, 35 in sq, 368 cu in. ; CC2 (new) 37 in sq charge area (different flow direction)

Notes:

Cooling Area: gives idea of cooling capacity driving
Charge Area: gives idea of flow restriction / pressure drop
Total Volume: gives idea of heat sink / radiated cooling capacity in stop and go

Note: flow efficency differences due to design also effect performance

 

I like my (tri-point racer inspired) Greddy smic, but 2 issues:

1) still, no one offers a proper duct. Chopped mine from a pettit.

2) lower elbow chokes the flow ... just look inside it. Close to stock high pressure drop. I ported 2 fl oz of aluminum from mine, and got about 1 psi more boost. get a shop with calipers and grinders to open it up, and leave .12" minimum wall thickness.

 

I may offer a duct on a limited basis.
https://www.rx7club.com/forum/showthread.php?t=432594